The manager of an Apple store wants to figure out whether consumers have different purchase intentions when they visit the store alone and when visit with other people, so that he can exert sales effort differently for different customers. He provides you with the following information (cross tabulation table) he collected:

purchase not purchase row sum

visit alone 70 60 130

visit with others 80 a 120

column sum. 150 b

q1 - Which hypothesis test would you use? What are the null hypothesis and alternative hypothesis?

q2- What are the values of a and b? What is the sample size?

q3- If the test result suggests that you reject the null hypothesis, what conclusion can you draw?