A psychologist would like to examine the effects of different testing methods on
ID: 3061973 • Letter: A
Question
A psychologist would like to examine the effects of different testing methods on the final performance of college students. One group gets regular quizzes, one group gets three large exams, and the third group only gets a final exam. At the end of the course, the psychologist interviews each student to get a measure of the student’s overall knowledge of the material.
State the null hypothesis. (1 Point)
Compute the necessary hypothesis test using a two-tailed test with = .05. Show your calculations. (5 Points)
Make a decision about your null hypothesis. (Include the critical value you used to base your decision.) (1 Point)
Write an APA format statement summarizing your findings. (Include a measure of effect size if necessary.) (2 Points)
Explain what would need to be done next to follow up on any significant effects. (2 Points)
Quizzes Exams Final Only 4 1 0 6 3 2 G = 32 3 1 0 X2 = 138 7 3 2 T = 20 T = 8 T = 4 SS = 10 SS = 4 SS = 4Explanation / Answer
ANOVA: Single Factor
SUMMARY
Groups
Count
Sum
Average
Variance
Quizzes
4
20
5
3.333333
Exams
4
8
2
1.333333
Final Only
4
4
1
1.333333
ANOVA
Source of Variation
SS
df
MS
F
P-value
F crit
Between Groups
34.66667
2
17.33333
8.666667
0.007977
4.256495
Within Groups
18
9
2
Total
52.66667
11
H0: Performance of students by all the three methods is same.
It includes mean and variance of the performance of the students in three methods separately.
It also gives ANOVA table along with p-value = 0.007977 < < 0.05 showing that H0 may be rejected.
Also notice that F Cal = 8.666667 > > F Critical = 4.256495
Means performance of students is significantly different in three methods.
ANOVA: Single Factor
SUMMARY
Groups
Count
Sum
Average
Variance
Quizzes
4
20
5
3.333333
Exams
4
8
2
1.333333
Final Only
4
4
1
1.333333
ANOVA
Source of Variation
SS
df
MS
F
P-value
F crit
Between Groups
34.66667
2
17.33333
8.666667
0.007977
4.256495
Within Groups
18
9
2
Total
52.66667
11
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