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 of49 cupsof 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 =0.05, the appropriate decision is ________.

Select one:

a.fail to reject the 8-ounces claim

b.increase the sample size

c.reduce the sample size

d.reject the 8-ounces claim