1. The following sample contains the number of chocolate chips in a sample of Chips Ahoy regular cookies. The mean is 21.4 chocolate chips and the standard deviation is about 3.4 chocolate chips. Construct a 99% confidence interval estimate of the mean number of chocolate chips in all such cookies. (21,20,16,25,20,26,19,24)

2. A 3M Privacy Filters poll in which 806 respondents were asked to identify their favorite seat when they fly and 61% chose the window seat. Create a 98% confidence interval estimate of the population proportion prefers the window seat.

3. A sociologist develops a test to measure attitudes about public transportation, and 29 randomly selected subjects are given the test. The sample variance of their score is 457.96 points. Construct 95% confidence interval estimate for the population standard deviation o and por population variance o^2