Solution-Confidence interval for the population mean

Confidence interval for the population mean customer

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Reference no: EM131449702

An advertisement for the Valu-For-Your-Money supermarket claims that customerservice is rated 9.8 (out of 10). A disgruntled customer disagrees with this claim. Thecustomer randomly selected a sample of 100 customers and found that the sample meanrating was 8.7 with a sample standard deviation of 0.8.

(a) Calculate the 97% confidence interval for the population mean customer servicerating.Assist the customer in conducting a hypothesis test, at the 3% level of significance, todetermine whether the claim on the advertisement was overstated.

(b) State the null and the alternative hypothesis for this test

(d) Calculate the p-value for this test.

(e) Use the p-value approach to state the conclusion of this test, giving reason for your answer.

Reference no: EM131449702

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Confidence interval for the population mean customer

Reference no: EM131449702

Reference no: EM131449702

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