Question: For many years it was considered that the standard tip in restaurants was 15%. However, now many restaurant customers tip more. A telephone survey asked

For many years it was considered that the standard tip in restaurants was 15%. However, now many restaurant customers tip more. A telephone survey asked respondents to report the amount of tip they usually give waiters and waitresses. Develop the hypothesis testing whether the average restaurant customer gives more than 15%? Does the data support the hypothesis? Explain clearly showing all the work

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