# Question: U S cell phone customers reportedly sent an average of

U. S. cell phone customers reportedly sent an average of 700 text messages per month in 2012, which is lower than previous years. Suppose AT& T would like to test the hypothesis that the average number of text messages per month has declined since 2012. A recent random sample of 75 U. S. cell phone users was selected and the number of text messages sent last month was recorded. These data can be found in the Excel file titled text messages. xlsx. Using σ = 0.05, answer the following:

a. State the null and alternative hypothesis.

b. Based on this sample, what conclusions can AT& T make about this population?

c. Estimate the p value for this test using Table 5 in Appendix A.

d. Determine the precise p value for this test using Excel.

e. Use PHStat to validate these results.

a. State the null and alternative hypothesis.

b. Based on this sample, what conclusions can AT& T make about this population?

c. Estimate the p value for this test using Table 5 in Appendix A.

d. Determine the precise p value for this test using Excel.

e. Use PHStat to validate these results.

## Answer to relevant Questions

Security experts are raising concerns about hackers targeting smartphones, as owners store more personal and financial information on the devices. In 2012, it was estimated that 7% of smartphone users were victims of ...According to the U. S. Department of Labor, 12.3% of the U. S. workforce was unionized in 2009. This percentage has declined steadily since the end of World War II, when more than a third of U. S. workers belonged to a ...Bob’s Sporting Goods believes the average age of its customers is 40 or less. A random sample of 60 customers was surveyed, and the average customer age was found to be 42.7 years. Assume the standard deviation for ...Consider the following data from two independent samples with equal population variances. Construct a 95% confidence interval to estimate the difference in population means. Assume the population variances are equal and that ...The following two samples were collected as matched pairs: a. State the null and alternative hypotheses to test if a difference in means exists between the populations represented by Samples 1 and 2. b. Calculate the ...Post your question