Question

A dentist is interested in obtaining information about delinquent (past due) accounts. Since the practice opened 9 years ago, delinquent accounts are normally distributed with an average of 59 days and a variance of 196.00 days. The dentist randomly selected a sample of 26 delinquent accounts with an average of 47 days.

a) The dentist wants to know what average number of days is more than 43% from the past 9 years.


b) Is the average days from the sample of 26 less than the 43% average from the past 9 years? choices (yes, no, N/A)

c) Suppose that an anxiety measure has a mean of 110 and SD of 20. The researcher only wants to work with 71% of the upper participants. What is the smallest average score the researcher should consider with a sample size of 31?

Answer 1

in a z normal distribution x=