Question3) Let say a researcher who studied on a chronic disease hospital outpatient. The following are the information researcher find from 49 records. The average outpatient visits per patients was 6 and the population standard of deviation of 3. ((each part 3 point total 9 point )

a)What statistical test researcher should use?

1.One proportion test

2.One sample Z-test when population variance is unknown

3.One sample Z-test when population variance is known

4.None of above