What is the correct answer to the following:a1

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What is the correct answer to the following:a1. 

Using a repeated measures design, Researcher A computes the following test statistic,

t (22) = 1.980, and decides to reject the null hypothesis. Using a matched samples design, Researcher B computes the same test statistic, t (22) = 1.980, but decides to retain the null hypothesis. Which of the follow can explain why this occurred?

a) The repeated measure design is a more powerful design than the matched samples design

b) Researcher A computed a one-tailed test; Researcher B computed a two-tailed test

c) Researcher A used a 0.05 level of significance; Researcher B used a 0.10 level of significance

a2. A researcher computes the following test statistic for a related samples t-test: t (22) = 3.14, p < 0.05. What is the proportion of variance for this test using the formula for omega-squared?

a) .28

b) .31

c) .34

d) Not enough information

a3. A researcher reports the following result for a related samples t-test at a 0.05 level of significance: t (40) = 3.02, p < 0.05 (d = 0.20). Is this result significant?

a) no, because the p value is less than 5%

b) Yes, because the p value is less than 5%

c) No, because the effect size is small

d) Yes, because the effect size is large

a4. In a probability distribution:

a) The sum of all probabilities is p=1.0

b) A probability can never be negative

c) The probabilities for all possible outcomes of a random variable are distributed

d) All of the above