What research method would be used to see if there is a relationship between watching the Ellen DeGeneres show and happiness levels

On Halloween, Oprah puts candy out in a bowl – there are 20 Reese’s, 25 Junior Mint boxes, and 15 Laffy Taffy’s. When the first tricker-treater comes by, what is the probability they choose a Reese’s?

Which of these is NOT involved in calculating a standard Z-score?

Would the F-ratio increase, decrease, or stay the same if you increased the sample variances?

A researcher obtains a Pearson correlation of r = .43 for a sample of n = 20 participants.  For a two-tailed test, which of the following accurately describes the significance of the correlation?

SSerror is a measure of what?

For which of the following situations would a repeated-measures design have an advantage over an independent-measures design?

Would the F-ratio increase, decrease, or stay the same if you increased the sample variances?

For a set of scores, the mean is 150 and the standard deviation is 12. What is the z-score for the score 180?

For a sample of n = 16 individuals, how large a Pearson correlation is necessary to be statistically significant for a two-tailed test with a = .05?