A quality control manager at a potato chip company uses the standard deviation in a production line as a measure of consistency. A bag of potato chips is intended to have a mean of 10 ounces, and the manager would like the standard deviation to be as low as possible. He gathers a random sample of 14 containers. Estimate the population standard deviation of the amount of chips at a 90% level of confidence. 9.77 10.1 10.1 9.98 10.01 9.83 9.86 10.13 10.18 9.96 10.15 10.06 9.93 10.1 (Data checksum: 140.16) a) Find the sample standard deviation: Round to 3 decimal places. b) Find the lower and upper x critical values at 90% confidence: Round to 3 decimal places. Lower: Upper: c) We are 90% confident that the standard deviation of the amount of chips is between and Round to 2 decimal places