True or False: A statistics professor wanted to test whether the grades on a statistics test were the same for upper and lower classmen. The professor took a random sample size of 10 from each, conducted a test and found out that the variances were equal. For this situation, the professor should use a t test with related samples.
Indicate whether the statement is true or false
Q. 2True or False: When you test for differences between the means of two independent populations, you can only use a two-tail test.
Indicate whether the statement is true or false
Q. 3True or False: The sample size in each independent sample must be the same if we are to test for differences between the means of two independent populations.
Indicate whether the statement is true or false
Q. 4Given the following information, calculate sp2, the pooled sample variance that should be used in the pooled-variance t test.
s12 = 4 s22 = 6
n1 = 16 n2 = 25
A) sp2 = 6.00 B) sp2 = 4.00 C) sp2 = 5.00 D) sp2 = 5.23
Q. 5Given the following information, calculate the degrees of freedom that should be used in the pooled-variance t test.
s12 = 4 s22 = 6
n1 = 16 n2 = 25
A) df = 39 B) df = 41 C) df = 25 D) df = 16
Q. 6In testing for the differences between the means of two independent populations, you assume that the 2 populations each follow a(n) ________ distribution.
Fill in the blank(s) with correct word
Q. 7In testing for differences between the means of two independent populations, the null hypothesis is
A) H0 : 1 - 2 = 2. B) H0 : 1 - 2 = 0. C) H0 : 1 - 2 < 2. D) H0 : 1 - 2 > 0.
Q. 8In testing for the differences between the means of 2 independent populations where the variances in each population are unknown but assumed equal, the degrees of freedom are
A) n1 + n2 - 1. B) n - 2. C) n1 + n2 - 2. D) n - 1.
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