To perform one sample t test.
Employer A states the average number of days missed in a year by each staff member is 4.0. Office personnel at random sampled a portion of their attendance records to find if this claim was accurate. For the earlier year, the following data was obtained from the sample group, regarding absences for that year: 4, 4, 3, 2, 6, 8, 7, 1, 9, 3, 1, and 6. at .05 level of significance, is there convincing evidence that the number of absences per employee has increased?