Exhibit 7-8: A pet store owner buys equal amounts of supplies for all types of animals.She wonders if the proportions of her customers are equal or are the same.She collected the following data over a period of a week:

$\begin{array}{lccc}
&&& \underline { \text { Products for }}\
&\underline { \text { Dogs }} & \underline { \text { Cats }} & \underline { \text { Fish }} & \underline { \text { Birds}} & \underline { \text { Rodents }}\
\text { Customers }&46&48&35&28&28
\end{array}$

-Refer to Exhibit 7-8.The store owner
A) should continue to buy supplies in equal quantities.
B) should adjust the quantity of supplies.
C) does not have enough evidence to make a decision.
D) None of these are true.

Question

Exhibit 7-8: A pet store owner buys equal amounts of supplies for all types of animals.She wonders if the proportions of her customers are equal or are the same.She collected the following data over a period of a week:

$\begin{array}{lccc}
&&& \underline { \text { Products for }}\
&\underline { \text { Dogs }} & \underline { \text { Cats }} & \underline { \text { Fish }} & \underline { \text {  Birds}} & \underline { \text {  Rodents }}\
\text { Customers }&46&48&35&28&28
\end{array}$

-Refer to Exhibit 7-8.The store owner
A) should continue to buy supplies in equal quantities.
B) should adjust the quantity of supplies.
C) does not have enough evidence to make a decision.
D) None of these are true.

Quizplus · Accepted Answer

To determine if the proportions of customers per type of animal are equal or not, we need to perform a chi-squared goodness-of-fit test. If the test result indicates a significant difference between the observed values and the expected values (which would be equal if the proportions were indeed equal), then the store owner should adjust the quantity of supplies accordingly. Therefore, more information is needed to perform such test, so option C is not correct. Option A is not necessarily true, as the proportions might not be equal. Therefore, the best choice is B, as the store owner should adjust the quantity of supplies if there is evidence that the proportions of customers are different across animal types.

Exhibit 7-8: a Pet Store Owner Buys Equal Amounts of Supplies