Which of the following tactics will reduce the power of a planned study using a t test for independent means?
A) using a less stringent significance level (such as .10 instead of .05 )
B) using more precise measures
C) increasing the size of your samples
D) using unequal sample sizes instead of equal ones (for the same number of participants)
Question 2
The results of a t test for independent means can be misleading when the sample variances are
A) not at all different (e.g., a 1 : 1 ratio).
B) a little different (e.g., a 1.5 : 1 ratio).
C) moderately different (e.g., a 2 : 1 ratio).
D) very different (e.g., a 4:1 ratio).
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