There is claim that the mean annual turover rate of the 300-count bottle of B Aspirin is 9. It is suspected that the mean is changed. Therefore, a random sample of 15 is chosen that show the average...

There is claim that the mean annual turover rate of the 300-count bottle of B Aspirin is 9. It is suspected that the mean is changed. Therefore, a random sample of 15 is chosen that show the average is 6 and standard deviation is 3. Use 0.14 significance level

The confidence level is