A random sample of 16 students showed that the variance in the number of hours they spent studying for a final exam was 25 hours.
a.) construct at 95% confidence interval for the population variance and standard deviation of hours spent studying. Assume the population of hours spent studying is normally distributed.
b.) Test at the 5% level of significance, whether the population standard deviation of hours spent studying is less than 10. Use the critical value approach.
Please show all steps and give explanations!!