A store manager wishes to investigate whether there is a relationship between the type of promotion offered and the number of customers who spend more than $30 on a purchase. Data will be gathered and placed into the two-way table below.Customer Spending by Promotion Run CustomersSpendingMore than $30CustomersSpending$30 or Less$10 off $50 15% off $5 off $25 Buy-1-Get-1 Half Off Which statement best describes how the manager can check if there is an association between the two variables?
Answer
A
The manager must check relative frequencies by row because there are more than two different promotions.
B
The manager must check relative frequencies by column because there are more than two different promotions.
C
The manager cannot use relative frequencies to look for an association because there are more than two different promotions.
D
The manager should check both relative frequencies by row and by column to look for an association.