CH 11: Inference for Distributions of Categories

11.2 Assignment AP Statistics 12 Is high blood pressure dangerous? Medical researchers classified each of a group of men as “high” or “low” blood pressure, then watched them for 5 years. (Men with systolic blood pressure 140mm Hg or higher were “high”; the others, “low.”) The following two-way table gives the results of the study. ___________________Died Survived Low blood pressure 21 2655 High blood pressure 55 3283____ 1. Is high blood pressure associated with a higher death

rate? Calculate and compare percents to answer this question. Make an appropriate graph to display the association.

2. Write null and alternative hypotheses for a chi-square

analysis of these data. 3. State and verify the conditions for performing the inference procedure. 4. The chi-square statistic is 8.86. Complete the chi-square analysis of the blood pressure data and

write your conclusion(s).

CH 11: Inference for Distributions of Categories

Market researchers know that background music can influence the mood and purchasing behavior of customers. One study in a supermarket in Northern Ireland compared three treatments: no music, French accordion music, and Italian string music. Under each condition, the researchers recorded the numbers of bottles of French, Italian and other wine purchased. Here is the two-way table that summarizes the data:

Is there a relationship between the type of wine purchased and the type of music that is playing? Give the details of the significance test that you perform to answer this question. Write a short summary of your conclusion that shows what you have found.