PLEASE DONT WRITE ON A PIECE OF PAPER AND TAKE A SCREEN SHOT OF IT. Round to 3 decimal places. This includes in the middle of calculations and your final results.

5) Columbia University wants to do a survey to estimate the average cost of textbooks per student this semester. Assuming the standard deviation in the population is $125, at least how many students would they need to survey to achieve a margin of error of no more than $20 at a 95% confidence level?

6) You shared the results of the survey above with administrators and they said that the margin of error was too large for their purposes. Describe two things you could do to decrease the margin of error.

7) Your boss says that he read a study that showed that African American women had a higher maternal mortality rate than white women. The study said that the p-value was 0.0042 and he asks you to tell him what that means and how that is relevant to the study's conclusion. What would you say? (Your answer should go further than just defining a p-value)