2. An educational psychologist studies the effect of frequent testing on retention of class material. In one section of an introductory course, students are given quizzes each week. A second section of the same course receives only two tests during the semester. At the end of the semester, both sections receive the same final exam, and the scores are summarized below: a. Frequent Quizzes n = 20 M = 73 Two Exams n = 20 M = 68 Which variables are described in this scenario and what are their scales of measurement?

In this exercise, a two-way table is shown for two groups, 1 and 2, and two possible outcomes, A and B. Outcome A Outcome B Total Group 1 30 20 50 Group 2 40 110 150 Total 70 130 200 Round your answers to three decimal places. (a) What proportion of all cases had Outcome A? 35 (b) What proportion of all cases are in Group 1? 25 (c) What proportion of cases in Group 1 had Outcome B? (d) What proportion of cases who had Outcome A were in Group 2? .2

Part A: A researcher wants to determine if there is a relationship between having been to college and preferring cats or dogs. Perform the appropriate test based on the following data:   Cats Dogs College 42 52 No College 36 47 (Rows: College. Columns: Cats vs Dogs)   Part B: Test the hypothesis that the same proportion of students find the following pet-types to be their favorite.  Cats Dogs Rocks Turtles 29 31 26 26

2. A researcher conducts a study examining the effectiveness of a group exercise program at an assisted living facility for elderly adults. One group of residents is selected to participate in the program, and a second group serves as a control. After 6 weeks, the researcher records a combined score measuring balance and strength for each individual. The data are as follows: Control n = 10 M = 12 SS = 120.5 Exercise n = 15 M = 15.5 SS = 190.0 Conduct the four steps for hypothesis testing and label a. Use a two-tailed test with a = .05. each step: Step1, Step 2, Step 3, and Step 4. b. Calculate Cohen's d. c. Are the data sufficient to conclude that thier is a significant difference? Write your answer in the form of a sentence.

A psychologist would like to examine the effects of different testing methods on the final performance of college students. One group has regular quizzes (n=4), one group has three large exams (n=4), and the third group only has a final exam (n=4). At the end of the course, the psychologist interviews each student to get a measure of the student’s overall knowledge of the material.                                    Quizzes           Exams         Final Only                                               4                   1                    0             N = 12                                         6                   4                    2             G = 36                                        3                   5                    0             ΣX2 = 164                                             7                   2                    2                                    T = 20          T = 12            T = 4                                   SS = 10       SS = 10…

Multiple Choice Question An educational software company wants to compare the effectiveness of its computer animation for teaching biology with that of a textbook presentation.  The company gives a biology pretest to each of a randomly chosen group of high school juniors, and then randomly divides them into two groups.  One group uses the animation, and the other studies the test.  The company retests all students and compares the increase in biology test scores in the two groups. What was the independent (explanatory) variable in this study?   A. Whether or not the student used the computer animation B. The student's score on the biology test C. What grade the student was in D. High school Jr's taking Biology

question(13): The researcher decided to conduct the study again and recruited an  additional 10 children  from the full time kindergarden and an additional from the part time kindergarden, This time they matched the children in full time kindergarden and partime kindergarden on SES, gender, age, and vocabulary score .They based their hypotheses  on the finding from a previous study  and wanted to see if full time kinder garden  would have better short term memory recall compared to children who attended partime kindergarden. Researchers read a list of 20 words ,then waited 2 minrderdenutes while the kids were having a snack, then they were asked to tell them how many words they remember. .Those who remember a word got a score of 1. A summary of the results is given below fulltime kindergarden: 15     9      10      8         11      7         14        12     11   13 partime kindergarden :  10   7      9      8         12       6         8          10      7      9 test the hypotheses…