8. The University rule of thumb is that students spend 2 hours outside of class per week for every
unit of course credit. For a 4 unit class, this means that students should spend 8 hours a week
studying for the course. A random sample of 8 students has been selected and asked how many
hours per week they spend on the 4 unit course. The sample values are:{ 11, 2, 2, 8, 4, 6, 4, 3. }.
The sample mean 5=
x and the sample standard deviation 10ˆ
=
a. Construct a 95% confidence interval for the population mean number of hours studied per
week in this course (assuming the population is normally distributed).