Hi please I need help with this questions!

Thank you in advance

Question 9 (3 points) Laura Naples, manager of Heritage Inn, periodically collects and tabulates information about a sample of the hotel's overnight guests. This information aids her in pricing and scheduling decisions she must make. The table below lists data on 10 randomly selected hotel registrants, collected as the registrants checked out. The data listed are; . Number of people in the group . Hotel's shuttle service used: yes or no Total telephone charges incurred . Reason for stay: business or personal Name of Registrant Number in Group Shuttle Used Telephone Charges ($) Reason for Stay Madam Sandler 2 yes Olpersonal Michelle Pepper 2 no 4.3 business Claudia Shepler 1 no 3.2 business Annette Rodriquez 2 no 2.9 business Tony DiMarco 2 yes 2.3 personal Amy Franklin 3 yes 4.65 business Julio Roberts 2 no 5.6 personal Edward Blackstone 3 yes 2.1 personal Sara Goldman 1 no 1.85 business Todd Atherton 2 no 5.8 business a. Do you use a normal (Z) or a T-distribution? Why? b. Before cell telephones became so common, the average telephone charge per registered group was at least $5.00. Laura suspects that the average has dropped. Test Ho: H 2 5 and Ha: u