diaper usage analysis by eric hays. project objective determine how many diapers are used daily by...

Diaper Usage Analysis

By Eric Hays

Project Objective

• Determine how many diapers are used daily by my twin babies.

• Determine what this is costing me on a monthly basis.

• Compare my results to the 8-12 diapers per day average stated in books.

Data Collection

• Data collected over 24 days.

• Time of day of each diaper change was recorded for each baby.

Data Analysis

• Number of diapers per day (each baby separately and both together)

• Time between diaper changes (each baby)

• Distribution of diaper changes throughout a 24 hour period (each baby separately and both together)

12111098

95% Conf idence Interv al f or Mu

11109

95% Conf idence Interv al f or Median

Violet

9.0000

1.0503

9.4294

Maximum3rd QuartileMedian1st QuartileMinimum

NKurtosisSkewnessVarianceStDevMean

P-Value:A-Squared:

11.0000

1.8956

10.5706

12.000011.000010.0000 9.0000 8.0000

24-1.098290.230653

1.82609 1.351310.0000

0.0160.920

95% Conf idence Interv al f or Median

95% Conf idence Interv al f or Sigma

95% Conf idence Interv al f or Mu

Anderson-Darling Normality Test

Diapers per day

1312111098

95% Conf idence Interv al f or Mu

11109

95% Conf idence Interv al f or Median

Evelyn

9.0000

1.2549

9.5266

Maximum3rd QuartileMedian1st QuartileMinimum

NKurtosisSkewnessVarianceStDevMean

P-Value:A-Squared:

11.0000

2.2649

10.8901

13.000011.000010.0000 9.0000 8.0000

24-8.5E-01

0.3077402.60688 1.614610.2083

0.1120.591

95% Conf idence Interv al f or Median

95% Conf idence Interv al f or Sigma

95% Conf idence Interv al f or Mu

Anderson-Darling Normality Test

Diapers Per Day

8 9 10 11 12

0

1

2

3

4

5

6

7

Violets diapers per Day

Fre

qu

en

cy

3

7

6

3

5

8 9 10 11 12 13

0

1

2

3

4

5

Evelyns Diapers per day

Fre

quen

cy

4

5 5 5

2

3

16 17 18 19 20 21 22 23 24 25

0

1

2

3

4

Total diapers per day

Fre

quen

cy

1

3 3 3 3 3

4

2

0

2

Number of Diaper Changes per Day

16 18 20 22 24

95% Conf idence Interv al f or Mu

19 20 21 22

95% Conf idence Interv al f or Median

Violet and Evelyn

A-Squared:P-Value:

MeanStDevVarianceSkewnessKurtosisN

Minimum1st QuartileMedian3rd QuartileMaximum

19.1519

1.9444

18.8268

0.3120.527

20.2083 2.50186.25906

0.232653-6.6E-01

24

16.000018.000020.000022.000025.0000

21.2648

3.5094

22.0000

Anderson-Darling Normality Test

95% Conf idence Interv al f or Mu

95% Conf idence Interv al f or Sigma

95% Conf idence Interv al f or Median

Total Diapers per Day

8:00 PM10:00 AM12:00 AM

60

50

40

30

20

10

0

total 24hr time

Fre

quen

cy

16

6060

5358

61

5250

35

27

11

11

Time of Day vs Number of Changes

9.58.06.55.03.52.00.5

95% Conf idence Interv al f or Mu

2.72.62.52.42.32.22.12.01.91.81.7

95% Conf idence Interv al f or Median

Violet

1.7500

1.8282

2.1009

Maximum3rd QuartileMedian1st QuartileMinimum

NKurtosisSkewnessVarianceStDevMean

P-Value:A-Squared:

2.0000

2.1880

2.6075

10.2500 2.5000 1.7500 1.2500 0.0000

2404.633432.231583.967661.991902.35417

0.00023.793

95% Conf idence Interv al f or Median

95% Conf idence Interv al f or Sigma

95% Conf idence Interv al f or Mu

Anderson-Darling Normality Test

Time Between Diaper Changes

10.08.57.05.54.02.51.0

95% Conf idence Interv al f or Mu

2.62.52.42.32.22.12.01.91.81.7

95% Conf idence Interv al f or Median

Evelyn

1.7500

1.7961

2.0731

Maximum3rd QuartileMedian1st QuartileMinimum

NKurtosisSkewnessVarianceStDevMean

P-Value:A-Squared:

2.0000

2.1464

2.5663

10.2500 2.5000 1.7500 1.0625 0.2500

2444.738802.168103.824341.955592.31967

0.00019.782

95% Conf idence Interv al f or Median

95% Conf idence Interv al f or Sigma

95% Conf idence Interv al f or Mu

Anderson-Darling Normality Test

Time Between Diaper Changes

Results

• 485- Total number of diapers over 24 days

• 245- Evelyn

• 240- Violet

• At 10 per baby per day- 600 diapers in a 30 day month

Results

• At $29 per 228 (Huggies @ Cosco)

• Monthly cost- $76.32

• The book rate of 8-12 diapers per baby per day is accurate