Discuss the below:
Q: 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
What is the test statistic value?
1.5
1.6
1.7
1.8
1.9
2.0
ASSUMING that null hypothesis can not be rejected, what statement can be made concerning validity of company advertisement?