In Griffith’s experiment, a substance from heat-killed S-type cells resulted in _______ of R-type cells. 

  What percentage of variance in the outcome is explained by the independent variables?

Extra Credit. No penalty for trying.  What is the variance of these scores? Suppose the following 3 students had these scores on a test: Student             Score Eric                              1 Erin                              5 Nick                             3   

List 1 source of measurement validity evidence from the Standards of Educational and Psychological Measurement AND briefly described how the evidence is collected..

King Article   This section has 9 questions based on Alison King’s article “Comparison of Self-Questioning, Summarizing, and Notetaking-Review as Strategies for Learning From Lectures”.  You do not need the article to answer the questions. “Asking and answering high-level questions during learning presumably facilitates students’ comprehension by inducing such cognitive abilities as focusing attention, organizing the new material, and integrating the new information with existing knowledge” In this statement what type of variable is “focusing attention”?      

 What is the independent variable(s) based on this title?   “The Effects of the Amount of Homework on Tenth Grade Students’ End of Course Math Test Scores”    

A researcher was interested in comparing the academic motivation of identified gifted 4th grade students and 4th grade students who were not identified as gifted.   100 gifted 4th grade students and 100, 4th grade students who were not identified as gifted were randomly selected and were administered a 10 item academic motivation questionnaire (Cronbach alpha = .96).  The responses to the questionnaire were combined to form an overall academic motivation score. What is the independent variable(s)?

What is the difference between the B and Beta?  What is the same about B and Beta?

A middle school wanted to evaluate the efficacy of a 6-month after-school program designed to teach 7th grade students math concepts. The program involved weekly sessions that used computer apps that had tutorials and practice problems. Students (n= 100) who were struggling in math (based on 6th grade math scores) were included in the program.  At the beginning of the year the students took a math pretest (reliability = .45) and scored a mean of 15 (out of 100). After 6-months 65 of the 100 students remained in the program.  These 65 students were posttested and scored an average of 45 on the identical test that was used at pretest (out of 100).  The reliability of the posttest was .75. For each threat to internal validity, define the threat and briefly discuss if this threat is likely. Statistical regression

King presents in Table 1 an effect size of 1.33 for the summarizing group’s posttest scores compared to the notetaking group’s posttest score..  Interpret this value