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Test the hypothesis that the population mean age

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1. A simple random sample of 80 customers is taken from a customer information file and the average age is 34. The population standard deviation σ is unknown. Instead the sample standard deviation s is also calculated from the sample and is found to be 5.5.

a. Test the hypothesis that the population mean age is greater than 30 using the critical value approach and a 0.05 level of significance.

i. H0 = µ= 30, H1= µ> 30

ii. 34-30/5.5/square root of 80 = 6.5049

iii. cv= 1.664 <--- what does this number mean??

iv. H0 is rejected. The mean age is greater than 30. <--- do we reject this because the cv is great than 0.05?

Reference no: EM132361713

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