Use the Following Information for Questions

Short Answer

Use the following information for questions:
Fifty-five customers of a large-chain grocery store are asked to fill out an in-store survey. One of the questions on the survey asks about the use of coupons, while another question asks how much money the customer spent on groceries during that specific trip. Mood's median test is used to compare the median amounts spent in the store for four groups defined by the type of coupons the customers used. The categories were 'no coupons', 'coupons from the newspaper', coupons from the store's weekly flyer', and 'both types of coupons'. The SPSS output is provided below.

-What is the null hypothesis for this test?