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eld a mean cost of 95 with a standard deviation of 18. Do the data support the claim at the 1% level? 17. An article in the San Jose Mercury News stated that students in the California state university system take 4.5 yearS, 01'; average to nish their undergraduate degrees. Suppose you believe that the mean time is longer. You conduct a survey do 49 students and obtain a sample mean of 5.1 with a sample standard deviation of 1.2. Do the data support your claim at e 1% level