1) Your instructor took a random sample of 25 students to examine the number of hours per week students surf the Internet for either personal information or material for course activities. The sample mean response was 5.85 hours and the sample standard deviation was 2.15 hours. Based on these results, and assuming normality for the population distribution of surfing time in hours, the instructor constructed a confidence interval extending from 5.16 to 6.96 hours per week for the population mean. What is the confidence level used for this interval?

2) In a random sample of 22 of 150 employees of a company, the mean number of hours overtime billed in the week of Black Friday was 9.5, with the sample standard deviation of 6.6 hours. Find the lower limit of a 98% confidence interval for the total number of hours overtime billed during the week.

do not round intermediate answers and round final answer to 4 decimal places thank you!