Estimate the mean amount as well as obtain the bound for the estimate.
A definite firm specializing in the manufacture and sale of leisure clothing has 80 retail stores in Florida and 140 in California. With each state as a stratum the firm wishes to estimate average sickleave time per employee for the past year. Each channel can be viewed as a cluster of employees, and total sick leave time for each store can be determined from records. Simple arbitrary samples of 8 stores from Florida and 10 from California gave the results shown in the table below (m_{i}  # of employees, y_{i } total days sick leave for the ith store).
Evaluation the average amount of sick leave per employee and obtain the bound for the estimate.
Florida

California

m_{i}

y_{i}

m_{i}

y_{i}

16

40

16

50

20

51

8

32

8

30

4

11

12

36

5

10

22

68

12

32

15

50

17

37

11

39

22

61

7

23

30

39



24

40



10

41
