Question

1. The owner of an Italian restaurant has redesigned the menu and wants to see if the amount customers spend (on average) will be greater with the new menu. He records the sales the week before the change and the sales the week after the change.

   Using the sample means and standard deviations for the two weeks, which statistical inference should he perform?

   	A.	a t test for paired samples (using differences)
   	B.	the owner should compute the mean dining bill for the week before the change and do a one-sample t test to test if the mean for the week after the change equals the mean before the change
   	C.	a two sample Z test
   	D.	a two-sample t test (independent samples)

3 points   

QUESTION 10

1. A college infirmary at a large university conducted an experiment to see which over-the-counter cough remedy is most effective for students complaining about coughing.

   They randomly assigned 150 students to one of three medicines, and followed up with them to determine the amount of relief they experienced. They classified the students relief as “none”, “some”, or “complete”.

   Which one of the significance tests given below should be used?

   	A.	One-sample proportion test.
   	B.	Chi-Square test.
   	C.	Two-sample t test for independent samples.
   	D.	A matched pairs t test.

Answer 1

9)

a two-sample t test (independent samples)

10) Chi-Square test. (As here variables are categorical)