To increase the value of estimated Cohen\'s d, a researcher increases the sample

Question

To increase the value of estimated Cohen's d, a researcher increases the sample size. Will this change the value of d?

(a) Yes; as sample size increases, effect size increases.

(b) No; as sample size increases, effect size decreases.

(c) No; the sample size is not used to compute effect size.

(d) Yes; as sample size increases, effect size decreases.

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A professor teaches a certain section of material using a lot of examples with sports and cars to illustrate. He is concerned that this may have biased his instruction to favor male students. To test this, he measures exam grades from this section of material among women (n = 10) and men (n = 10). The mean score in the male group was 84 ± 4.0 (M ± SD); in the female group, it was 78 ± 8.0 (M ± SD) points. If the null hypothesis is that there is no difference in exam scores, then test the null hypothesis at a 0.05 level of significance.

(a) Exam scores were significantly higher in the male group, t(18) = 2.83, p < 0.05.

(b) Exam scores were the same between groups, t(18) = 2.12, p > 0.05.

(c) Exam scores were significantly higher in the male group, t(18) = 2.12, p < 0.05.

(d) Exam scores were the same between groups, t(18) = 1.00, p > 0.05.

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There is no difference between a point estimate and an interval estimate.

(a) True

(b) False

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If the null hypothesis is inside the confidence interval, then the decision was likely to ________ using hypothesis testing.

(a) reject the null hypothesis

(b) retain the null hypothesis

Thank you for your help!! :)

Explanation / Answer

Solution:-

=> option D) Yes; as sample size increases, effect size decreases

=> option (c) Exam scores were significantly higher in the male group, t(18) = 2.12, p < 0.05.

=> option (b) Flase
-> A point estimate is our single best guess for estimating a population parameter, while an interval estimate provides a range of plausible values for a population parameter.

=> option (b) retain the null hypothesis

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