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restaurant has been 80 The restaurant was recently remodeled and now the management claims the mean customer rating is not equal to 80 In a sample of 54 customers chosen at random the mean customer rating is 88 4 Assume that the population standard deviation of customer ratings is 21 1 Is there enough evidence to support the claim that the mean customer rating is different from so Perform a hypothesis test using the 0 05 level of significance a State the null hypothesis H and the alternative hypothesis H Ho H 0 given by Z b Perform a hypothesis test The test statistic has a normal distribution so the test is a z test Here is some other information to help you with your test G Standard Normal Distribution Step 1 Select one tailed or two tailed O One tailed O Two tailed Step 2 Enter the critical value s Round to 3 decimal places is the value that cuts off an area of 0 025 in the right tail The test statistic has a normal distribution and the value is 20 025 Step 3 Enter the test statistic Round to 3 decimal places 03 02 11 Since the value of the test statistic lies in the rejection region the null hypothesis is rejected So there is enough evidence to support the claim that the mean customer rating is not equal 80 Since the value of the test statistic lies in the rejection region the null hypothesis is not rejected So there is not enough evidence to support the claim that the mean customer rating is not equal 80 O O Since the value of the test statistic doesn t lie in the rejection region the null hypothesis is rejected So there is enough evidence to support the claim that the mean customer rating is not equal 80 Since the value of the test statistic doesn t lie in the rejection region the null hypothesis is not rejected So there is not enough evidence to support the claim that the mean customer rating is not equal 80 X 020 0 0 0 0 x OSO O O c Based on your answer to part b choose what can be concluded at the 0 05 level of significance about the claim made by the management X S X S

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