1. You are doing a project on how much time (in hours) it takes people to adjust after traveling to a new time zone. You know that the population standard deviation is 30 but you're not sure what the population mean time is. You take a sample of 100 individuals and find a sample mean of 19 hours. What is the 90% confidence interval for the true population mean? Round to two decimal places.

A.None of the answers given is correct

B.17.11-20.89 hours

C.14.07-23.94 hours

D.16.99-22.01 hours

2.Your colleague is looking into the typical amount of stress that people are feeling over the COVID-19 pandemic. In a sample of 81 people, he finds a mean stress level of 69, on a scale of 0 to 100. He knows that the population standard deviation for stress scores is 12. Calculate the margin of error for a 99% confidence interval of the true population mean stress score.

A.1.33

B.12.92

C.3.43

D.2.66

Please help me with both and thank you