1. For an independent-measures research study, the data show an 8-point difference between the two treatment means and a pooled variance of 4. Given this information, what is the value of Cohen's d?

Group of answer choices

a. 4/8

b. 8/4

c. 8/2

d. This cannot be answered without knowing the sample sizes.

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2. For the independent-measures t statistic, what is the effect of increasing the sample variances?

a. Decrease the likelihood of rejecting H₀ and increase measures of effect size.

b. Increase the likelihood of rejecting H₀ and increase measures of effect size.

c. Decrease the likelihood of rejecting H₀ and decrease measures of effect size.

d. Increase the likelihood of rejecting H₀ and decrease measures of effect size.