The average age of promotional coupon holders of a clothing store was determined through a past research study and is 30 years old. In order to test whether the average age has increased in the current year, the management conducted a study on 50 coupon holders, and after data processing, an average age of 33 years and a standard deviation of 5.5 years were obtained. 

a) Using a significance level of 5%, can we conclude that there is sufficient statistical evidence to support the claim that the average age has increased? 

b) What should be the average age recorded in the sample to change the previous decision?

Answer rating: 100% (QA)

a Using a significance level of 5 we can conduct a hypothesis test to determine if there is suff... View the full answer