A Coffee-Dispensing Machine Is Supposed to Deliver 8 Ounces of Liquid

Multiple Choice

A coffee-dispensing machine is supposed to deliver 8 ounces of liquid into each paper cup,but a consumer believes that the actual mean amount is less.The consumer obtained a sample of 49 cups of the dispensed liquid with average of 7.75 ounces.If the sample variance of the dispensed liquid delivered per cup is 0.81 ounces,and α = 0.05,the appropriate decision is ________.

A) increase the sample size
B) reduce the sample size
C) fail to reject the 8-ounces claim
D) maintain status quo
E) reject the 8-ounces claim