# An educational psychologist is interested in knowing whether the experience of attending preschool is related

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9. An educational psychologist is interested in knowing whether the experience of attending preschool is related to subsequent sociability. She identifies two groups of first graders: those who had attended preschool and those who had not. Then each child is assigned a sociability score on the basis of observations made in the classroom and on the playground. The following sociability results are obtained:

Attended preschool Did not attend preschool

n1 = 12, ∑X1 = 204, SS1 = 192 n2 = 16, ∑X2 = 248, SS2 = 154

a. Set up the appropriate statistical hypotheses.

b. Perform the test (α = .05)

16. The director of Academic Support services wants to test the efficacy of a possible intervention for undergraduate students who are placed on academic probation. She randomly assigns 28 such students to two groups. During the first week of the semester, students in Group 1 receive daily instruction on specific strategies for learning and studying. Group 2 students spend the same time engaged in general discussion about the importance of doing well in college and the support services that are available on campus. At the end of the semester, the director determines the mean GPA for each group:

Group 1 (strategy instruction) Group 2 (general discussion)

n1 = 14, X1 = 2.83, S1 = .41 n2 = 14, X2 = 2.26, S2 = .39

a. Compare the two sets of results with respect to sx1 - sx2, the sample of *t* ratio, and the appropriate statistical decision.

7. Study the following ANOVA summary, and then provide the missing information for the cells designated a-f:

Source SS df MS F P

Between groups 3

Within-groups 64

_______________________________________

Total 349 19

_______________________________________________________________

a. How many groups are there in Problem 7? (How do you know?)

b. What is the total sample size in Problem 7? (How do you know?)

(problem 8)

Source SS df MS F P

Between groups 1104 3.00

Within-groups 184

_______________________________________

Total 4416

_______________________________________________________________

c. How many groups are there in Problem 8? (How do you know?)

d. What is the total sample size in Problem 8? (How do you know?)

- 7 years ago

**An educational psychologist is interested in knowing whether the experience of attending preschool is related**

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