For the independent t test, the null hypothesis is always stated in terms
of
a. the sample means
b. the population means
c. both of these
d. neither of these
Question 2In an analysis of variance with a between-groups population variance estimate of 30 and a within-groups estimate of 25, the F ratio is
A) 25 / (3025) = 5.00
B) (3025) /30 = 0.17
C) 25/30 = 0.83
D) 30/25 = 1.20
Question 3Ann conducts a study, and finds that the estimated population variances for the groups are 12.8, 16.3, 15.1, and 19.9. What is the within-groups estimate of the population variance?
A) (12.82 + 16.32 + 15.12 + 19.92) / (4 1) = 351.18.
B) (12.82 + 16.32 + 15.12 + 19.92) / 4 = 263.39.
C) (12.8 + 16.3 + 15.1 + 19.9) / (4 1) = 21.37.
D) (12.8 + 16.3 + 15.1 + 19.9) / 4 = 16.03.
Question 4Assuming that the difference between two independent sample means is 6.24, and S2difference = 27, what is the calculated t score?
A) (6.24 + 2) / 27 = 0.31
B) (6.24 + 2) / 27 = 8.24 / 5.20 = 1.58
C) 6.24 / 27 = 0.23
D) 6.24 / 27 = 6.24 / 5.20 = 1.20
Question 5ased on the following results, which would be the correct use of the formula, t = (M1 M2) / Sdifference? Sample 1: Mean = 60; Variance of the distribution of means = 2 Sample 2: Mean = 50; Variance of the distribution of means = 7
A) t = (7 2) / (50+60)
B) t = (60 50) / (22+72)/2
C) t = (60 50) / (2+7)
D) t = (60 50) / (2+7)
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