Author Question: In a random sample of 60 dog owners enrolled in obedience training, it was determined that the mean ... (Read 58 times)

segrsyd · **on:** Jul 24, 2018

In a random sample of 60 dog owners enrolled in obedience training, it was determined that the mean amount of money spent per owner was 109.33 per class.

Assuming the population standard deviation of the amount spent per owner is 12, construct and interpret a 95 confidence interval for the mean amount spent per owner for an obedience class. A) (106.29, 112.37); we are 95 confident that the mean amount spent per dog owner for a single
obedience class is between 106.29 and 112.37.
B) (106.78, 111.88); we are 95 confident that the mean amount spent per dog owner for a single
obedience class is between 106.78 and 111.88.
C) (106.23, 112.43); we are 95 confident that the mean amount spent per dog owner for a single
obedience class is between 106.23 and 112.43.
D) (106.74, 111.92); we are 95 confident that the mean amount spent per dog owner for a single
obedience class is between 106.74 and 111.92.

Question 2

When constructing a confidence interval about the mean response of y in a linear regression, the t-distribution is used with degrees of freedom.

A) n - 2 B) n - 1 C) n + k - 2 D) n1 + n2 - 2