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The mean age of San Bernardino Valley College students in a previous term was 26.6 years...

The mean age of San Bernardino Valley College students in a previous term was 26.6 years old. An instructor thinks the mean age for online students is older than 26.6. She randomly surveys 56 online students and finds that the sample mean is 29.4 with a standard deviation of 2.1. Conduct a hypothesis test using a 90% confidence level.

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