An analyst has a set of normally distributed intervally scaled data resulting from two observations on the same sample of subjects, and he wishes to investigate if there is any difference in these two means. The appropriate statistical procedure is
a. z-test for difference in two means.
b. Analysis of variance.
c. Paired sample t-test.
d. Chi square goodness of fit test.
e. Regression analysis.
Question 2
In order to use the pooled sample variance when testing the difference in two population means, what must be assumed?
a. The sample means are unbiased estimates of the population means.
b. The population variances are equal.
c. The population means are equal.
d. The population variances are inversely proportional.
e. The sample means are unequal.
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