Here is a sample of amounts of weight change (kg) of college students in their freshman year:

12, 9, 6, 7, where 7 represents a loss of 7 kg and positive values represent weight gained. Using the 200 given bootstrap samples, complete parts (a) and (b) below.

Construct a 90% confidence interval of the mean weight change for the population, using the 200 bootstrap samples.

Construct a 90% confidence interval estimate of the standard deviation of the weight changes for the population, using the 200 bootstrap samples.