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Question
The Baker Oil and Gas Company has four retail locations, code-named A, B, C, and D. The following table illustrates the percentage of total company sales at each store and also the percentage of customers at that store who make purchases with debit cards:| Store | Proportion of Total Sales | Proportion of Customers Using Debit |
| A | 0.18 | 0.32 |
| B | 0.30 | 0.19 |
| C | 0.41 | 0.18 |
| D | 0.11 | 0.40 |
Based on this information, given that a customer has used a debit card to make the purchase, the sale was most likely made at store D.
Answer
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A) Because t = -2.69 is less than -2.3456, do not reject H0
Conclude that 2012 average out-of-pocket prescription drug expenses are not lower than the 2002 average.
B) Because t = -2.69 is less than -2.3456, reject H0
Conclude that 2012 average out-of-pocket prescription drug expenses are lower than the 2002 average.
C) Because t = -1.69 is less than -0.8712, reject H0
Conclude that 2012 average out-of-pocket prescription drug expenses are lower than the 2002 average.
D) Because t = -1.69 is less than -0.8712, do not reject H0
Conclude that 2012 average out-of-pocket prescription drug expenses are not lower than the 2002 average.
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A) p-value = 0.0872 > 0.025; therefore do not reject H0
B) p-value = 0.0422 > 0.005; therefore do not reject H0
C) p-value = 0.0314 < 0.105; therefore reject H0
D) p-value = 0.0121< 0. 0805; therefore reject H0
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