(solution) The amount of time spent per week in studying STA 392 is of interest.

(solution) The amount of time spent per week in studying STA 392 is of interest.

The amount of time spent per week in studying STA 392 is of interest. A random sample of 15 students are recorded: (in hours) 4.5 6.8 5.4 6.2 5.6 8.1 3.2 7.3 7.2 6.4 5.3 4.2 6.5 6.0 7.5Assume the amount of time spent in STA 392 is normally distributed.Use Statistics software to answer the following two questions.(a) Find a 90% confidence interval for estimating the true average time spent in STA 392.(b) Find a 99% confidence interval for estimating the true average time spent in STA 392.