Answer the following questions please Question 3 5 points Su

Answer the following questions please

Question 3 (5 points) Suppose you\'re interested in testing a claim that psychology majors perform logic problems better than chemistry majors. Suppose that on average a group of psychology majors perform logic problems better than a group of chemistry majors in a recent bit of research. One of the assistants thinks this means that psychology students are better at logic. Given logic test scores from a sample of psychology majors and from a sample of chemistry majors, what further information would you need to obtain about these two groups and their performance before you could conclude anything? Choose all of the information that is necessary. the mean of both groups the standard deviation or variance of both groups the correlation between the two groups the sample size of both groups Hide hint for Question 3 Think how we could compare group means. What would be needed to do this?

Solution

Question 3:

Answer : Mean of both the groups

Question 7:

Answer:

- The degree of freedom for the test is df _total = (n₁ -1) + (n₂ -1 ) where n₁ is the sample size for group 1 and n₂ is the sample size for group 2.

- If the sample size are different we should use a weighted average (or pooled) variance estimate instead of each separate sample\'s variance estimate.

- The standard error for an independent sample t-test is calculated in the same way as the standard error for a paired -sample t-test.