Karen wants to advertise how many chocolate chips are in each Big Chip cookie at her bakery. She randomly selects a sample of 38 cookies and finds that the number of chocolate chips per cookie in the...

Karen wants to advertise how many chocolate chips are in each Big Chip cookie at her bakery. She randomly selects a sample of 38 cookies and finds that the number of chocolate chips per cookie in the sample has a mean of 18.2 and a standard deviation of 1.5. What is the 98% confidence interval for the number of chocolate chips per cookie for Big Chip cookies?


a.) Which distribution table will be used to find the critical value and why?

b.) With 98% confidence, we can say the true population mean of chocolate chips per cookie in Big Chip cookies is between  and .


Use 1 decimal place.