Question: Over a period of years, a toothpaste has received a mean rating of 5.9. on a 7- point scale, for overall customer satisfaction with the

Over a period of years, a toothpaste has received a mean rating of 5.9. on a 7- point scale, for overall customer satisfaction with the product. Because of a minor unadvertised change in the product, there is concern that the customer satisfaction may have changed. Suppose the satisfaction ratings from a sample of 60 customers have a mean of 5.60 and a standard deviation of .87. Do these data indicate that the mean satisfaction rating is different from 5.9? Test with a = .05. What is the p-value for the test?

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