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It seems these days that college graduates who are employed full-time work more than 40-hour weeks. Data are available that can help us decide if this is true.A survey was

recently sent to a group of adults selected at random. There were 16 respondents who were college graduates employed full-time. The mean number of hours worked per week by these 16 respondents was 46 hours, with a standard deviation of 9 hours.Assume that the population of hours worked per week by college graduates employed full-time is normally distributed with mean u. Can we conclude that u is greater than 40 hours? Use the 0.05 level of significance.

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