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An office equipment company advertises that it will deliver equipment within 15 days of purchase. A sample of 49 past deliveries is taken to test whether company's advertisement is valid. The delivery time for this sample was 16.2 days with a sample standard deviation of 5.6 days. Which of the following is correct

* What is the null?

* If test of hypothesis at 5% level of significance is desired, what is (are) the critical value(s) for test statistics?

1.96

-1.96

+1.96

1.645

-1.645

+1.645

None of the above answers is correct
*****************************************
* What is the test statistic value?

1.5

1.6

1.7

1.8

1.9

2.0

None of the above answers is correct
******************************************
* ASSUMING that null hypothesis can not be rejected, what statement can be made concerning validity of company advertisement?

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An office equipment company advertises that it will deliver equipment within 15 days of purchase. A sample of 49 past deliveries is taken to test whether company's advertisement is valid. The delivery time for this sample was ...

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