Mathematics, 17.12.2021 18:30 tracyrios98
A cell phone company knows that the mean length of calls for all of its customers in a certain city is 9.2 minutes. The company is thinking about offering a senior discount to attract new customers, but first wants to know whether or not the mean length of calls for current customers who are seniors (65 and over) is the same as it is for the general customer pool. The only way to identify seniors is to conduct a survey and ask people whether they are over age 65. Using this method, the company contacts a random sample of 200 seniors and records the length of their last call. The sample mean and standard deviation for the 200 calls are 8 minutes and 10 minutes, respectively.
a. Do you think that the data collected on the 200 seniors are approximately bell-shaped? Explain.
b. Is it valid to conduct a one-sample t-test in this situation? Explain.
c. In spite of how you may have answered part (b), carry out the five steps to test the hypotheses of interest in this situation using α = .05. (Use a p-value, not a rejection region.)
Answers: 3
Mathematics, 21.06.2019 16:50
Which of the following points is collinear with (-2,1) and (0,3)
Answers: 3
Mathematics, 21.06.2019 20:30
If there is 20 dogs in the shelter and 5 dogs get homes, and then 43 more dogs come. how many dogs are there in the shelter?
Answers: 1
Mathematics, 21.06.2019 23:30
Sara has 2 2/3 cup taco meat. she needs 1/6 cup to make one taco. how many tacos can sara make with the taco meat she has?
Answers: 1
A cell phone company knows that the mean length of calls for all of its customers in a certain city...
History, 18.03.2021 02:00
Mathematics, 18.03.2021 02:00
Biology, 18.03.2021 02:00
Mathematics, 18.03.2021 02:00
Social Studies, 18.03.2021 02:00
Mathematics, 18.03.2021 02:00
Chemistry, 18.03.2021 02:00
Biology, 18.03.2021 02:00
History, 18.03.2021 02:00
Mathematics, 18.03.2021 02:00