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1.
The transgenic mouse model is useful for studying the causes and potential cures for human genetic diseases. Exposing high school biology students to laboratory experience in developing transgenic animal models is logistically prohibitive. Computer-based simulation, however, offers this potential in addition to advantages of fidelity and reach. This study describes and evaluates a computer-based simulation to train advanced placement high school science students in laboratory protocols, a transgenic mouse model was produced. A simulation module on preparing a gene construct in the molecular biology lab was evaluated using a randomized clinical control design with advanced placement high school biology students in Mercedes, Texas (n?=?44). Pre-post tests assessed procedural and declarative knowledge, time on task, attitudes toward computers for learning and towards science careers. Students who used the simulation increased their procedural and declarative knowledge regarding molecular biology compared to those in the control condition (both p?<?0.005). Significant increases continued to occur with additional use of the simulation (p?<?0.001). Students in the treatment group became more positive toward using computers for learning (p?<?0.001). The simulation did not significantly affect attitudes toward science in general. Computer simulation of complex transgenic protocols have potential to provide a ??virtual?? laboratory experience as an adjunct to conventional educational approaches.  相似文献   

2.
Climate change science is a challenging topic for student learning. This quantitative study examined the effectiveness of a geospatial curriculum approach to promote climate change science understandings in an urban school district with eighth-grade students and investigated whether teacher- and student-level factors accounted for students’ climate change knowledge achievement. The participants included 12 science teachers and 956 eighth-grade students. Data included a pre- and posttest climate change assessment measures for both teachers and students and a teacher measure of Geospatial Science-Technological Pedagogical Content Knowledge. Paired-sample t tests revealed statistically significant gains from pretest to posttest on their climate change knowledge (p < .001; effect sizes being large on multiple-choice items and medium on the open-ended response assessment). Both ordinary least squares (OLS) multiple regression and 2-level hierarchical linear modeling found that students’ initial climate change knowledge and gender were significant predictors for students’ posttest scores, p < .05. Students’ pretest scores were the strongest significant predictor of the posttest scores, p < .001. Neither the teachers’ climate change knowledge nor their Geospatial Science-Technological Pedagogical Content Knowledge had significant association with the students’ posttest scores. Teaching years was a significant predictor for students’ posttest scores in OLS regression (p < .001). The findings provide support that a geospatial curriculum approach is an effective science curriculum approach for learners in urban middle-level education.  相似文献   

3.
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4.
What determines consonant doubling in English? This question is pursued by using a large lexical database to establish systematic correlations between spelling, phonology and morphology. The main insights are: Consonant doubling is most regular at morpheme boundaries. It can be described in graphemic terms alone, i.e. without reference to phonology. In monomorphemic words, consonant doubling depends mostly on the word ending. Certain endings correlate with double consonants (e.g. <er> as in <summer>), while others correlate with single consonants (e.g. <it> as in <visit>). What is more, it is the graphemic form of the word ending that determines the presence or absence of double consonants: The word endings <-ic> and <-ick>, for example, are homophonous, but the former almost always occurs with single consonants (e.g. <panic>), the latter with double consonants (e.g. <derrick>). That makes graphemic word endings peculiar entities: Like suffixes, they are recurring and they have distributional properties—but unlike suffixes, they have no morphosyntactic or semantic function.  相似文献   

5.
This study is part of a 5-year National Science Foundation-funded project, Transforming Elementary Science Learning Through LEGO? Engineering Design. In this study, we report on the successes and challenges of implementing an engineering design-based and LEGO?-oriented unit in an urban classroom setting and we focus on the impact of the unit on students’ content understanding of simple machines. The LEGO? engineering-based simple machines module, which was developed for fifth graders by our research team, was implemented in an urban school in a large city in the Northeastern region of the USA. Thirty-three fifth grade students participated in the study, and they showed significant growth in content understanding. We measured students’ content knowledge by using identical paper tests and semistructured interviews before and after instruction. Our paired t test analysis results showed that students significantly improved their test and interview scores (t?=??3.62, p?<?0.001 for multiple-choice items and t?=??9.06, p?<?0.000 for the open-ended items in the test and t?=??12.11, p?<?0.000 for the items in interviews). We also identified several alternative conceptions that are held by students on simple machines.  相似文献   

6.
This quantitative study examined the effectiveness of a geospatial curriculum approach to promote energy literacy in an urban school district and examined factors that may account for energy content knowledge achievement. An energy literacy measure was administered to 1,044 eighth-grade students (ages 13–15) in an urban school district in Pennsylvania, USA. One group of students received instruction with a geospatial curriculum approach (geospatial technologies (GT)) and another group of students received ‘business as usual’ (BAU) curriculum instruction. For the GT students, findings revealed statistically significant gains from pretest to posttest (p?<?0.001) on knowledge of energy resource acquisition, energy generation, storage and transport, and energy consumption and conservation. The GT students had year-end energy content knowledge scores significantly higher than those who learned with the BAU curriculum (p?<?0.001; effect size being large). A multiple regression found that prior energy content knowledge was the only significant predictor to the year-end energy content knowledge achievement for the GT students (p?<?0.001). The findings support that the implementation of a geospatial curriculum approach that employs learning activities that focus on the spatial nature of energy resources can improve the energy literacy of urban middle-level education students.  相似文献   

7.
The Minnesota Marking Attitude Scale was administered to 33 regular education and 20 special education teachers. Results showed that regular educators believed that marks have a positive influence on students while special educators believed marks have neither a positive nor a negative influence (p < .005). Special educators believed to a greater extent than did regular educators that marks should be manipulated in order to influence student behavior (p < .05) and that different standards should be used to evaluate different students (p < .001). Teachers also marked students' written short answers to two typical school questions. No significant differences were found between the marks assigned by the two groups of teachers to either set of answers. Assigned marks, attitude scores, and years of teaching experience were not significantly correlated with each other. Results are discussed in terms of implications for mainstreaming.  相似文献   

8.
This study is an evaluation of a STEM initiative in one school district with five participating middle schools. I used two quasi-experimental methods including instrumental variables and inverse propensity score weights to test the effect of the initiative on students’ cognitive and non-cognitive outcomes. Overall, students at STEM schools demonstrated lower science achievement (p < .05). Subgroup analyses showed that Limited English Proficient students at STEM schools demonstrated increased reading achievement and fewer unexcused absences (p < .001). Black students demonstrated increased grit (p < .01), and Hispanic students demonstrated increased control and relevance in learning (p < .001).  相似文献   

9.
How do concrete objects that cue real-world knowledge affect students' performance on mathematics word problems? In Experiment 1, fourth- and sixth-grade students (N = 229) solved word problems involving money. Students in the experimental condition were given bills and coins to help them solve the problems, and students in the control condition were not. Students in the experimental condition solved fewer problems correctly. Experiment 2 tested whether this effect was due to the perceptually rich nature of the materials. Fifth-grade students (N = 79) were given: perceptually rich bills and coins, bland bills and coins, or no bills and coins. Students in the perceptually rich condition made the most errors; however, their errors were least likely to be conceptual errors. Results suggest that the use of perceptually rich concrete objects conveys both advantages and disadvantages in children's performance in school mathematics.  相似文献   

10.
The current paper examined the effects of A Balanced Reading Approach for Children Always Designed to Achieve Best Results for All (ABRA), a web-based literacy programme developed by the the Centre for the Study of Learning and Performance (CSLP) at Concordia University, on primary school children in Hong Kong. The participants were 249 Primary 1 students from two low social economic status schools in Hong Kong and the two schools were well-matched on many demographic characteristics. All participating students were pre-tested in the fall and post-tested in the following spring. After adjusting for pretest differences, the treatment school scored significantly higher than the controls on three of the six outcome measures at post-tests: phoneme-grapheme correspondence (ES = +0.22, p < 0.05), phoneme segmentation (ES = +0.46, p < 0.00), and nonsense word fluency (ES = +0.22, p < 0.06). Both treatment and control students scored similarly on word reading, listening comprehension, and initial sound fluency. The outcomes of the study provides some promising evidence of the effects of ABRA on Chinese primary students in Hong Kong, especially on the enhancement of phonological skills, thus leading to early success in the formative years of learning English as a Second Language (ESL). Practical implications are discussed.  相似文献   

11.
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12.
Teaching behavior impacts student psychopathology. This study explored the associations between teaching behavior types and depressive symptoms in students. The Teaching Behavior Questionnaire (TBQ) and the Center for Epidemiological Studies Depression Scale (CES‐D) were completed by 763 middle and 976 high school students from private Catholic schools. In the middle school sample, a confirmatory factor analysis confirmed the four‐factor structure of the TBQ previously found in public high schools. As predicted, a two‐level hierarchical linear model (HLM) analysis with the high school sample found that only the Negative Teaching Behavior scale of the TBQ was positively related to CES‐D scores, (p < .05). A separate two‐level HLM analysis with middle school students found the Instructional Behavior scale was negatively related to CES‐D scores (p < .05) and the Organizational Behavior scale was positively related to the CES‐D scores (p < .01). Implications of the findings for school personnel are discussed.  相似文献   

13.
One hundred elementary‐ and middle‐school students were administered the Universal Nonverbal Intelligence Test (UNIT; B.A. Bracken & R.S. McCallum, 1998) and the Leiter International Performance Scale‐Revised (Leiter‐R; G.H. Roid & L.J. Miller, 1997). Correlations between UNIT and Leiter‐R scores were statistically significant ( p < .001), ranging from .33 to .74. The UNIT Full Scale score was 5 points higher than the Leiter‐R Full Scale score, t = 4.73, p < .001. © 2006 Wiley Periodicals, Inc. Psychol Schs 43: 143–148, 2006.  相似文献   

14.
We investigated the spelling of derivational and inflectional suffixes by 10–13-year-old Greek children. Twenty children with dyslexia (DYS), 20 spelling-level-matched (SA) and 20 age-matched (CA) children spelled adjectives, nouns, and verbs in dictated word pairs and sentences. Children spelled nouns and verbs more accurately than adjectives and inflections more accurately than derivational suffixes. DYS children performed worse than CA in all cases and worse than SA in verb inflections, but similar to SA in all the remaining cases, consistent with a delayed rather than deviant performance pattern. Qualitative analysis showed that uncommon vowel graphemes were often replaced by more common patterns. Children with dyslexia may have weaknesses in grasping morphological information and/or in applying this knowledge to spell word suffixes.  相似文献   

15.
An experiment with random assignment examined the effectiveness of a strategy to learn unfamiliar English vocabulary words during text reading. Lower socioeconomic status, language minority fifth graders (M?=?10?years, 7?months; n?=?62) silently read eight passages each focused on an unknown multi-syllabic word that was underlined, embedded in a meaningful context, defined, depicted, and repeated three times. Students were grouped by word reading ability, matched into pairs, and randomly assigned to one of two conditions. In the strategy condition, students orally pronounced the underlined words during silent reading. In the control condition, students penciled a check if they had seen the underlined words before but did not say the words aloud. Results of ANOVAs showed that the oral strategy enhanced vocabulary learning (ps?<?.01), with poorer readers showing bigger effect sizes than better readers in remembering pronunciation-meaning associations and spellings of the words. In a second experiment, 32 fifth graders from the same school described the strategies they use when encountering unfamiliar words in context. Better readers reported more word-level strategies whereas poorer readers reported more text-based strategies. Our explanation is that application of the word-level strategy of decoding new words aloud strengthened connections between spellings, pronunciations, and meanings in memory compared to silent reading of new words, particularly among poor readers who were less skilled and less likely to use this strategy unless instructed to do so.  相似文献   

16.
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17.
This study, the purpose of which is to determine an efficient instructional design for different levels of spatial abilities, investigates: (1) the main effects of visual treatments in simulation environments on comprehension and the transfer of chemistry knowledge and (2) the interaction effects of the visual treatments and the learners’ spatial abilities. Two hundred and fifty-seven middle school students were randomly assigned to two experimental conditions. The results indicated: (1) a significant main effect of the treatment condition for both comprehension (p < 0.001) and transfer (p < 0.005) tests, where the treatment group performed better than the control group and (2) a significant interaction effect (p < 0.05) between the instructional treatment conditions and level of spatial ability for the comprehension test: Low spatial ability learners performed better in the treatment group than in the control group, whereas high spatial ability learners performed similarly regardless of the instructional conditions.  相似文献   

18.
Abstract

The average grades in college, the Medical College Admission Test (MCAT) scores, and academic achievement were studied among students in relation to the National Board (NB) scores in the 4-year program at one medical school. Results indicate that most effective predictor variable for performance on the NB examinations is the second year of medical school. In Part I of the NB examinations, the most effective contribution of the second year academic record is found in Physiology; the least effective contribution is indicated for Biochemistry. In Part II of the NB examinations, the most effective contribution of the second year academic record is found in Medicine and Surgery; the least effective contribution is noted for Psychiatry. Further, a student's MCAT scores were not related to academic achievement in medical school.  相似文献   

19.
This study describes the development and validation of a science and engineering (S/E) career interest survey (CIS). This 56 question survey was developed to measure the overall S/E career interests of 7th through 9th grade students. In the CIS, a S/E career is characterized as one which requires the completion of at least a four-year college program with a major in science, science education, or engineering. The CIS is divided into four major parts. In Part I (30 questions), students are expected to select from occupational activities, while in Part II (20 questions) they are to select from various occupations. Part III (5 questions) and Part IV together make up the CIS internal verification scale. The CIS test-retest reliability coefficients for one week and eight months were calculated as 0.96 (n = 57, grades 7–9) and 0.78 (n = 1937, grade 8), respectively. The KR-21 estimate for the CIS was calculated as 0.92. Criterion-related validity coefficients were calculated in two ways: (a) CIS scores were correlated with the Kuder GIS science subscale (r = 0.75, n = 45, grades 7–9), and (b) CIS scores were correlated with a CIS internal verification scale (r = 0.59, n = 127, grades 7–9). Evidence to support the construct validity of the CIS was collected by two methods: (a) for 7–9 grade students (n = 45), the CIS score was found to correlate 0.75 with the scientific subscale and ?0.42 with the artistic sub-scale, of the Kuder GIS. (b) the second method compared the scores of known groups. Test results for students in grades 7-9 (n = 127; n = 1937) showed a statistically significant difference between the scores of boys and girls on S/E career interest. The readability of the CIS was seventh grade level.  相似文献   

20.
Abstract

The purpose of the study was to assess high school students’ knowledge in the area of consumer economics and to identify school variables related to that knowledge. Six hundred fifty-three seniors from five Pennsylvania school districts were administered the “Consumer Economics Content Area Measure” of the Adult Performance Level Program (APL). Multiple regression analysis and chi-square procedures were used to analyze the data. Of the school variables examined, only the Scholastic Aptitude Test (SAT) scores in mathematics and reading showed a moderate correlation with the APL scores.  相似文献   

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