In: Statistics and Probability
A dentist is interested in obtaining information about delinquent (past due) accounts. Since the practice opened 5 years ago, delinquent accounts are normally distributed with an average of 59 days and a variance of 169.00 days. The dentist randomly selected a sample of 31 delinquent accounts with an average of 47 days.
a) The dentist wants to know what average number of days is more than 42% from the past 5 years.
b) Is the average days from the sample of 31 more than the 42% average from the past 5 years?