Question

To promote its services, a walk-in medical clinic claims that the mean waiting time required for patients to see a doctor is 15minutes or less. To investigate this claim, a local consumer agency sent a sample of 36 “sick” people to the clinic. These people had to wait, on average, 20 minutes to see a doctor. The population standard deviation is known to be 9 minutes. Compute the value of the appropriate test statistic to test this claim.

Enter your answer as a decimal rounded to two places.

Test statistic =

Answer 1

Solution :

This is the left tailed test .

The null and alternative hypothesis is ,

H0 :   =15

Ha : < 15

Test statistic = z

= ( - ) / / n

= (20 - 15) / 9 / 36

Test statistic = 3.33

answered by: anonymous