h: p QUESTION 4 In a sample of 70 bowling balls from Paramount the mean weight w

Question

h: p QUESTION 4 In a sample of 70 bowling balls from Paramount the mean weight was 39 ounces. Construct a 95% confidence interval for all the bowling balls. Assume the weight is normally distributed and the standard deviation is 4 ounces. T TI Arial 3 (12pt) Words:0 Path: p QUESTION 5 Continuing with Babe Ruth, Louisville Slugger would like to create a 90% confidence interval for the average weight of all their bats. They would like to make sure the margin of error is within 1.1 ounces. A study of all of Babe Ruth's bats showed that the lowest weight was 47 ounces and the highest was 55 ounces. How large of a sample does Louisville Slugger need to compute the 90% confidence

Explanation / Answer

mean is 39 and s is 0.4

for 95% confidence,the z value is 1.96

thus lower limit =mean-z*s=39-1.96*0.4=38.216

upper limit =mean+z*s=39+1.96*0.4=39.784

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