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 ________.A) pB) tC) zD) χ

Answer:Option C) z-statisticStep-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 = 20Sample mean = 16 ouncesPopulation standard Deviation =  2 ouncesWe 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.