1. At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was
told, “You can average $80 a day in tips.” Assume the population of daily tips is normally
distributed with a standard deviation of $9.95. Over the first 35 days she was employed at
the restaurant, the mean daily amount of her tips was $84.85. At the .01 significance level,
can Ms. Brigden conclude that her daily tips average more than $80?
4. Refer to the Buena School District bus data.
a. Select the variable for the number of miles traveled last month. Conduct a test of
hypothesis to determine whether the mean number of miles traveled is equal to 840.
Use the .01 significance level. Find the p-value and explain what it means.
b. Using the maintenance cost variable, conduct a test of hypothesis to determine whether
the mean maintenance cost is less than $500 at the .05 significance level. Determine the
p-value and interpret the result.
Preview of Grumney_Family_Restaurant.xlsx