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An airline company recently boasted about its 72 customer satisfaction rate A corporate watchdog group believes that this percentage is greatly exaggerated and the real percentage of satisfied customers is lower than 72 The group randomly surveyed 922 recent customers of this airline and found that only 648 reported being satisfied with the airline Using a significance level of 5 test the hypothesis that the proportion of satisfied customers of this airline is less than 72 Use the critical value method State the null and alternative hypothesis for this test Ho V H 7 Determine if this test is left tailed right tailed or two tailed Oright tailed Otwo tailed Oleft tailed Should the standard normal 2 distribution or Student s t distribution be used for this test O The standard normal 2 distribution should be used O The Student s t distribution should be used Determine the critical value s for this hypothesis test Round the solution s to two decimal places If more than one critical value exists enter the solutions using a comma separated list Determine the test statistic Round the solution to two decimal places Determine the appropriate conclusion for this hypothesis test O The sample data do not provide sufficient evidence to reject the null hypothesis that the proportion of all customers of this airline that are satisfied is 0 72 and thus we conclude that the proportion of all customers of this airline that are satisfied is likely 0 72 O The sample data provide sufficient evidence to reject the alternative hypothesis that the proportion of all customers of this airline that are satisfied is less than 0 72 and thus we conclude that the proportion of all customers of this airline that are satisfied is likely 0 72 O The sample data do not provide sufficient evidence to reject the alternative hypothesis that the proportion of all customers of this airtine that are satisfied is less than 0 72 and thus we conclude that the proportion of all customers of this airline that are satisfied is likely less than 0 72 O The sample data provide sufficient evidence to reject the null hypothesis that the proportion of all customers of this airline that are satisfied is 0 72 and thus we conclude that the proportion of all customers of this airline that are satisfied is likely less than 0 72

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