a.State the null and alternative hypotheses and the level of significance. b. Find the sample statistics, test statistic, and p-value. Label everything with the correct letters/notation and draw the normal curve on paper. c. Conclusion and Interpretation
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
table:
55.83
60.47
58.60
49.88
52.45
51.26
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
44.45
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
a.State the null and alternative hypotheses and the level of significance.
b. Find the sample statistics, test statistic, and p-value. Label everything with the correct letters/notation and draw the normal curve on paper.
c. Conclusion and Interpretation
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