The average monthly cell phone bill was reported to be $50.07 by the U.S. Wireless Industry. Random sampling of a large cell phone company found the following monthly cell phone charges:

At the 0.05 level of significance can it be concluded that the average phone bill has increased?
Perform each of the following steps.
a. State the hypotheses and identify the claim.
b. Find the critical value(s).
c. Find the test value.
d. Make the decision.
e. Summarize the results.
Use the traditional method of hypothesis testing unless otherwise specified.
Assume that the population is approximately normally distributed.

Transcribed Image Text:

55.83 49.88 62.98 70.42 60.47 52.45 49.20 50.02 58.60 51.29