Was there more spread in the midterm scores, or the final scores?

There is a strong negative association between midterm and final scores. 

Was the average midterm score around 25, 50, or 75?

Which exam was harder -- the midterm or the final?

Was the SD of the midterm scores around 5, 10, or 20?

Which of the following correctly computes the estimated SE of the sample mean under the null?

Which formula shows the right calculation of the p-value?

Which of the following expression is the z-test statistic?

If a respondent is chosen at random from those who found their bill larger than expected, what is the probability that they intend to switch energy providers?

Which of the following are correct interpretations of the confidence intervals you made in Task 4b?