When establishing the confidence interval for the average weight of a cereal box, assume that the population standard deviation is known to be 2 ounces. based on a sample, the average weight of a sample of 20 boxes is 16 ounces. the appropriate test statistics to use is ) pb) tc) zd) χ

Option C) z-statistic

Step-by-step explanation:

We are given the following information:

We have to establish confidence interval for the average weight of a cereal box.

Sample size = 20

Sample mean = 16 ounces

Population standard Deviation =  2 ounces

We have to decide the appropriate test statistic.  

We use z-statistic for approximation whenever the population standard deviation is given.

Thus appropriate test statistic to establish confidence interval is z-statistic.                              

the answer to the expression is 83