One Sample T-test and Confidence IntervalThe average monthly cell phone bill was reported last year to be $53.88 by the U.S. Wireless Industry. Random sampling of a large cell phone company found the current monthly cell phone charges (in dollars) in the table on the left. At the 0.05 level of significance, can it be concluded that the average cell phone bill has increased? Also find an 85% confidence interval estimate of the current mean monthly cell phone bill.Cell Phone Bills55.8360.4758.6049.8852.4551.2932.9849.2070.4250.0275.0441.8835.0061.5858.9961.2562.0080.2173.6071.5242.8038.6549.5461.8846.3074.1048.6363.4544.4336.7771.9677.7942.1363.2467.5674.4431.7776.9173.0479.9267.1078.1337.9545.6068.8854.4743.4754.5776.1280.4538.0857.2154.28a. State the random variable and the parameter in words.b. State the null and alternative hypotheses and the level of significance.c. State and check the assumptions for a hypothesis test.

a. Let X be the random variable representing the monthly cell phone bill of a user. the expected…

Answered: One Sample T-test and Confidence…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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One Sample T-test and Confidence Interval

The average monthly cell phone bill was reported last year to be $53.88 by the U.S. Wireless Industry. Random sampling of a large cell phone company found the current monthly cell phone charges (in dollars) in the table on the left. At the 0.05 level of significance, can it be concluded that the average cell phone bill has increased? Also find an 85% confidence interval estimate of the current mean monthly cell phone bill.

Cell Phone Bills

55.83
60.47
58.60
49.88
52.45
51.29
32.98
49.20
70.42
50.02
75.04
41.88
35.00
61.58
58.99
61.25
62.00
80.21
73.60
71.52
42.80
38.65
49.54
61.88
46.30
74.10
48.63
63.45
44.43
36.77
71.96
77.79
42.13
63.24
67.56
74.44
31.77
76.91
73.04
79.92
67.10
78.13
37.95
45.60
68.88
54.47
43.47
54.57
76.12
80.45
38.08
57.21
54.28