Allante Pizza delivers pizzas throughout its local market area at no charge to the customer.However,customers often tip the driver.The owner is interested in estimating the mean tip income per delivery.To do this,she has selected a simple random sample of 12 deliveries and has recorded the tips that were received by the drivers.These data are: Suppose the owner is interested in developing a 90% confidence interval estimate.Given the fact that the population standard deviation is unknown,what distribution will be used to obtain the critical value?
A)s-distribution
B)t-distribution
C)z-distribution
D)k-distribution

Question

Allante Pizza delivers pizzas throughout its local market area at no charge to the customer.However,customers often tip the driver.The owner is interested in estimating the mean tip income per delivery.To do this,she has selected a simple random sample of 12 deliveries and has recorded the tips that were received by the drivers.These data are:  Suppose the owner is interested in developing a 90% confidence interval estimate.Given the fact that the population standard deviation is unknown,what distribution will be used to obtain the critical value?
A)s-distribution 
B)t-distribution 
C)z-distribution 
D)k-distribution

Quizplus · Accepted Answer

Since the population standard deviation is unknown, a t-distribution will be used to obtain the critical value for the confidence interval.

Allante Pizza Delivers Pizzas Throughout Its Local Market Area at No