A newlywed couple is trying to choose one of two neighborhood supermarkets for their grocery shopping. They decide to randomly select 20 items, check their price at each store, then conduct a test to determine if, on average, one store is significantly less expensive than the other. What test should they conduct?

They should conduct "matched pairs t-test"

Step-by-step explanation:

From the question, the data are blocked by the grocery items and thus we need to test whether there is a significant mean difference between two sets of paired data by defining the paired difference and also defining the hypothesis. Thus, the test i will recommend that suits this purpose is the "matched pairs t-test"