Question

Conductivity is one of many properties measured to evaluate water quality. The table below (also attached...

Conductivity is one of many properties measured to evaluate water quality. The table below (also attached as an Excel file) contains conductivity measurements (µS/cm) of groundwater samples from a single well.

First, prepare a graph of the raw data.

Then set up estimates of the conductivity

  • population average (95% CI),
  • population standard deviation (95% CI), and
  • a future individual measurement (95% PI).

Also develop a 95% tolerance interval estimate of the conductivity that will include 99% of the conductivities.

Finally, prepare a table that presents your estimates in a tabulated form.

Your submission should take the form of a word document that includes the graph, the table of estimates, and your calculations.

Conductivity

Week

1220

1

1130

2

1400

3

1400

4

1625

5

1670

6

2100

7

1070

8

1622

9

1680

10

1900

11

1700

12

1600

13

1580

14

1620

15

1700

16

1840

17

1772

18

1325

19

1150

20

1300

21

1400

22

1360

23

1340

24

1250

25

1360

26

1417

27

1810

28

1700

29

1725

30

1500

31

1725

32

1700

33

2000

34

1900

35

2040

36

970

37

1150

38

1100

39

1010

40

880

41

975

42

1300

43

1050

44

1116

45

1350

46

1350

47

1250

48

1250

49

1300

50

1230

51

1250

52

1130

53

1300

54

Homework Answers

Answer #1

First, prepare a graph of the raw data.

Conductivity
count 54
mean 1,436.89
sample standard deviation 301.24

population average (95% CI),

confidence interval 95.% lower 1,356.54
confidence interval 95.% upper 1,517.23

population standard deviation (95% CI), and

a future individual measurement (95% PI).

Predicted values for: Conductivity
95% Confidence Interval 95% Prediction Interval
Week Predicted lower upper lower upper Leverage
55 1,237.964 1,082.021 1,393.908 651.805 1,824.123 0.076

Also develop a 95% tolerance interval estimate of the conductivity that will include 99% of the conductivities.

tolerance interval 95.% lower 846.48
tolerance interval 95.% upper 2,027.30
   half-width 590.41
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions