In a Random Sample of 60 Dog Owners Enrolled in Obedience

Multiple Choice

In a random sample of 60 dog owners enrolled in obedience training, it was determined that the mean amountof money spent per owner was $109.33 per class. Assuming the population standard deviation of the amountspent per owner is $12, construct and interpret a 95% confidence interval for the mean amount spent per ownerfor 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 $\$ 111.92$ .