# Tip Standard Deviation

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At the time she was hired as a server at a restaurant, Beth was told she could average more than $20.00 a day in tips. Over the first 35 days she was employed, the mean daily amount of her tips was $24.85, with a standard deviation of $3.24. At the .01 significance level, can Beth conclude that she is earning an average of more than $20.00 in tips?

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At the time she was hired as a server at a restaurant, Beth was told she could average more than $20.00 a day in tips. Over the first 35 days she was employed, the mean daily amount of her tips was $24.85, with a standard deviation of $3.24. At the .01 significance level, can Beth conclude that she is earning an average of more than $20.00 in tips?

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N (number of samples) = 35

<br>s (sample standard deviation ) = $3.24

<br>m (sample mean) = $24.85

<br>

<br>X is the random variable that describes tips earened in a day,

<br>u is the mean of X and

<br>

<br>We want to test the null hypothesis H0 : u = 20.00

<br>against ...

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