The management of a department store is interested in estimating the difference between the mean credit purchase of customers using the stores credit card versus those customers using a national major credit card. You are given the following information:    STORES CARD MAJOR CREDIT CARD Sample Size  75 52 Sample Mean $185 $150 Sample Std Dev $12 $8 Q21a = Refer to Exhibit 2. A Point estimate for the difference between the mean purchases of the users of the two credit cards is:

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Exhibit 2

The management of a department store is interested in estimating the difference between the mean credit purchase of customers using the stores credit card versus those customers using a national major credit card. You are given the following information: 

  STORES CARD MAJOR CREDIT CARD
Sample Size  75 52
Sample Mean $185 $150
Sample Std Dev $12 $8

Q21a = Refer to Exhibit 2. A Point estimate for the difference between the mean purchases of the users of the two credit cards is:

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