In advertisement for the Value-For-Your-Money supermarket claims that customer service is rated 9.8 (out of 10). A disgruntled customer disagrees with this claim. The customer randomly selected a...

In advertisement for the Value-For-Your-Money supermarket claims that customer service is rated 9.8 (out of 10). A disgruntled customer disagrees with this claim. The customer randomly selected a sample of 85 customers and found that the sample mean rating was 8.7 with a sample standard deviation of 0.8. Assist the customer in conducting a hypothesis test, at the 5% level of significance, to determine whether the claim on the advertisement was overstated