The manager of a department store is thinking about establishing a new billing system for the store's credit customers. She determines that the new system will be cost-effective only if the mean monthly account is more than $175. A random sample of 400 monthly accounts is drawn, for which the sample mean is $178. The manager knows that the accounts
The manager of a department store is thinking about establishing a new billing system for the store's credit customers. She determines that the new system will be cost-effective only if the mean monthly account is more than $175. A random sample of 400 monthly accounts is drawn, for which the sample mean is $178. The manager knows that the accounts are approximately
1) 10%
5) 5%
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We have enough evidence to reject the null for 1) but not 2) |
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We have enough evidence to reject the null for 2) but not 1) |
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We have enough evidence to reject the null for both 1) and 2) |
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We do not have enough evidence to reject the null for both 1) and 2)
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