A researcher is examining the effects of stress on the problem solving tasks amo
ID: 3133965 • Letter: A
Question
A researcher is examining the effects of stress on the problem solving tasks among three different groups. The 3 groups were high stress, moderate stress, and no stress. An ANOVA was performed on the data and the source table is provided below, < Source of Variance SS df MS F Level of Significance Between groups 97.4 2 48.70 8.14 0.01 Within groups 161.4 27 5.98 Total 258.8 29
Source of Variance
SS
df
MS
F
Level of Significance
Between groups
97.4
2
48.70
8.14
0.01
Within groups
161.4
27
5.98
Total
258.8
29
From this source table how many participants were included in the study?
Select one:
a. 2
b. 30
c. 27
d. 29
e. Cannot be determined
From this source table what decision should be made regarding the null hypothesis?
Select one:
a. Reject the null
b. Fail to reject the null
c. Cannot be determined from this information.
d. Its the alternate that should be rejected.
Source of Variance
SS
df
MS
F
Level of Significance
Between groups
97.4
2
48.70
8.14
0.01
Within groups
161.4
27
5.98
Total
258.8
29
Explanation / Answer
1. Correct answer: Option (B) 30
Since the df of Total is N - 1 = 29 implies N = 30
2. Here, alpha is not given. Generally we can assume that alpha = 5% = 0.05
From table, P value = 0.01 which is < alpha(= 0.05), So we reject H0.
Correct Answer: (A)
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