Crawling Babies: The data in the next column represent the age (in weeks) at which babies first crawl based on a survey of 12 mothers conducted by Essential Baby. It was verified that the data are normally distributed and that s = 10.00 weeks.

(a) Construct and interpret a 95% confidence interval for the population standard deviation of the age (in weeks) at which babies first crawl. Enter the LOWER BOUND here.

(b) Construct a 95% confidence interval. Enter the UPPER BOUND here.

52 30 44 35 39 26

47 37 56 26 39 28