5. [-/3 Points] DETAILS You may need to use the appropriate appendix table to answer this question. MY NOTES PRACTICE ANOTHER In a study entitled How Undergraduate Students Use Credit Cards, it was reported that undergraduate students have a mean credit card balance of $3,173. This figure was an all-time high and had increased 44% over the previous five years. Assume that a current study is being conducted to determine if it can be concluded that the mean credit card balance for undergraduate students has continued to increase compared to the original report. Based on previous studies, use a population standard deviation = $1,000. (a) Select the correct null and alternative hypotheses. Ho: H 8 Ha: 8 (b) A sample of 130 shoppers showed a sample mean waiting time of 8.4 minutes. Assume a population standard deviation of = 3.2 minutes. Compute the test statistic. (Round your answer to two decimal places.) Find the p-value. (Round your answer to four decimal places.) p-value = (c) At a 0.05, what is your conclusion? Do not reject Ho. There is sufficient evidence to conclude that the population mean waiting time differs from 8 minutes. Reject Ho. There is not sufficient evidence to conclude that the population mean waiting time differs from 8 minutes. Do not reject Ho. There is not sufficient evidence to conclude that the population mean waiting time differs from 8 minutes. Reject Ho. There is sufficient evidence to conclude that the population mean waiting time differs from 8 minutes. (d) Construct a 95% confidence interval for the population mean. (Round your answers to two decimal places.) to Does the confidence interval support your conclusion? The confidence interval --Select--- the hypothesized value of Mo, therefore we ---Select--- Ho. The conclusion ---Select-- the same as in part (c).