A marketing manager for a chain of brake shops was considering two different services for an in-store

Question:

A marketing manager for a chain of brake shops was considering two different services for an in-store promotion: a wheel alignment or an oil change. She wanted to know if there was different demand for these services, before deciding which promotion to run nationally. She test marketed the wheel alignment promotion in ten shops in Cleveland, and the oil change promotion in ten shops in Detroit. She recorded the following sales of the two promotions:

Part 1--State the null and alternate hypotheses in plain English sentences (not equations).
Part 2--Using Excel or any statistical package you are familiar with, do a direct comparison of two means to determine if there is a significant difference between the sales of the two services. Print out the computer results.
Part 3--Can you reject the null hypothesis? Why or why not?