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