Question

An educational psychologist studies the effect of frequent testing on retention of course material. In one of the professor's sections, students are given quizzes each week. The second section 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: Frequent quizzes: n = 15, M = 72, SS = 100 Two exams: n = 15, M = 68, SS = 110 Do the data indicate that testing frequency had a significant effect on performance? Use a two-tailed test at the .01 level of significance.

Part 1: What is t?

Part 2: What is the critical value?

Part 3: We would reject H0, and conclude that there is good evidence that that testing frequency had an effect.

Part 4: What is r2?

Part 5: There was a _____ effect.

Answer #1

An educational psychologist studies the effect of frequent
testing on retention of class material. In one of the professor's
sections, students are given quizzes each week. The second section
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.
Do the data indicate that testing frequency has a significant
effect on performance? Use a two-tailed test with α = .01. Include
the null...

An educational psychologist studies the effect of frequent
testing on retention of class material. In one of the professor's
sections, students are given quizzes each week. The second section
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.
Frequent Quizzes
Two Exams
n = 15
n = 15
M = 72
M = 68
If the first sample variance is s^2=32 and the...

An educational psychologist studies the effect of frequent
testing on retention of class material. The students are randomly
assigned to one of two sections of an introductory course. 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. Please choose the statistical test
that is most appropriate for this research....

Question 7
An educational psychologist studies the effect of frequent
testing on retention of class material. The students are randomly
assigned to one of two sections of an introductory course. 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. Please choose the statistical test
that is most appropriate for...

A psychologist is examining the educational advantages of a
preschool program. A sample of 16 fourth grade children is
obtained. Half of these children (n = 8) attended preschool and the
others (n = 8) had not. The psychologist records the scholastic
achievement score for each child.
Preschool
No Preschool
12
11
20
14
15
18
18
8
22
12
10
13
14
16
17
8
a.
State the null hypothesis.
b.
Identify the appropriate statistical test
c.
Calculate the...

A social psychologist is interested in whether warmer
temperatures influence aggressive behavior. She had 60 people take
part in an experiment in which she randomly split participants in
two equal groups. In one group, the participants had to complete a
frustrating cooperative puzzle together in a very warm room. In the
second group, participants completed the same frustrating
cooperative puzzle, but the room was much cooler. In both
experiments the number of aggressive acts were counted. Data from
the experiment...

________ client-centered therapy centers on the patient's goals
and ways of solving problems.
Select one:
a. Rogers'
b. Freud's
c. Beck
d. Ellis
Question 2
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Question text
A frequently prescribed drug therapy for managing one's
depression is ____________.
Select one:
a. Adderall
b. Lithium
c. Prozac
d. Thorazine
Question 3
Not yet answered
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Question text
A major goal of modern inpatient psychiatric treatment is:
Select...

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