Question: Please help! A gas station's owner has observed the average amount of money spent in the convenience store by a sample of 100 customers is

Please help!

A gas station's owner has observed the average amount of money spent in the convenience store by a sample of 100 customers is $23, while the sample standard deviation is $18. (You can assume the sampling distribution is normal). The owner believes that the average customer spends no more than $20. Can we reject this hypothesis with 95% confidence? What about with 90% confidence

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