Project #3125 - stats Project

Project 1
Due Date: March 11, 2013
Possible points: 20

Data was collected by a random survey of mothers  during November 2010. 57 mothers were asked about  the gestation period for their pregnancies (length of pregnancy in weeks), the birth weight, the length of their newborns and whether they smoked while they were pregnant.

All of the outputs created in Statcrunch must be copied and pasted to a Word document. Provided comments on your graphs where asked to draw a conclusion. Save your file as Project1 and upload it using the “Upload a file”  button in the project page.

1)     Create a histogram for the weights of the  infants.
Click on Graphics >> Histogram >> Select Weights >> Next >>  Frequency: Relative Frequency, Start Bin at 1500, Bin Width 500 >> Next  >> Create Graph .

Once you create the graph, click on “Options”, and then select  Export to My Results” .  Copying the graph to “My Results” will save your graph. You can access this graph anytime from the “My Results” folder.  To access this graph later, click on “StatCrunch” ( the first menu button  on the left, click on “Session Results”). You need to copy and paste this graph to a Word document.

2)     Create a box-and-whisker plot for the gestation period. Copy and paste your graph to your Word document.
Click on Graphics >> Boxplot >> Select the column “gestation period” >> Next >> Select “ Draw the box horizontally” and then click on “Create graph”
To save this graph online click on “Options” and then “ Export to My Results”  folder. To copy and paste this graph to your Word document, click on “Copy” and then paste the graph to your Word document.

3)     Create a QQ Plot for the weight  in grams.
Click on Graphics >> Select QQ Plot >>  Select the column “ Weight” >> Create Graph.
Do the data values seem to be close to the oblique line? If yes, write q conclusion that the population of weights at birth is normally distributed.

4)     Create a Stem-and-Leaf plot of the length of the babies at birth.
Click on Graphics >> Stem and Leaf >> Select the column “Length” >> Create Graph >> Click on “ Options” to save the graph in “My Results” folder and copy it and paste it to your Word document.

5)     Find the mean and the standard deviation of the weights at birth
Click on Stat >> Summary Stats >> Select the column “Weight” >> Next >> Select the mean and the standard deviation >> Click on “Calculate”. Click on “Options” to copy and paste the results to your Word document.

6)     Use the answers from part 5 to find this probability.
One woman is selected at random, what is the probability that her child at birth has a weight of less than 3000 grams?
Click on Stat >> Calculators >> Normal >> enter the values of the mean and standard deviation from  part 5 >>  Next to Prob ( x, select  < = ), enter 3000 >> Click on Compute. Copy and paste your answer to your Word document. Do not round your answer.

7)     Use the answers from part 5 to  find this probability.
One woman is selected at random, what is the probability that her child at birth has a weight of more than 3500 grams?
Click on Stat >> Calculators >> Normal >> enter the values of the mean and standard deviation from  part 5 >>  Next to Prob ( x, select  > = ), enter 3500 >> Click on Compute. Copy and paste your answer to your Word document. Do not round your answer.

8)     Find the mean and the standard deviation of the weights at birth  from  women who smoke and the ones who did not.
Click on Stat >> Summary Stats >> Select the column “Weight” >> Group by: choose the column: smoking >>Next >> Select the mean and the standard deviation >> Click on “Calculate”. Click on “Options” to copy and paste the results to your Word document.
Do the same thing for the length and the gestation period.  Based on your results do you think there was a difference in length, weight, or gestation period being a smoker or a non-smoker. Explain!

9)     Create s a scatter plot comparing the gestation period with the height of the infant at birth.
Click on Graphics >> Scatter Plot >> X-variable: Gestation Period , Y-Column: Length at Birth; Sort by: Smoking >> Create Graph. Copy and paste the graph to your Word document.  Does the graph show evidence that smoking affects height of infant at birth? Explain!

 

Gestation Period (Weeks)

Weight in Grams

Length in cm

Smoking

var5

 

 

 

34

3612

54.61

NO

 

 

 

 

35

3640

50.8

NO

 

 

 

 

39

3444

41.91

NO

 

 

 

 

38

3388

44.45

NO

 

 

 

 

39

3276

45.72

YES

 

 

 

 

35

1974

45.72

YES

 

 

 

 

37

2996

50.8

YES

 

 

 

 

38

3612

53.34

NO

 

 

 

 

37

3080

50.8

NO

 

 

 

 

39

3612

53.34

NO

 

 

 

 

41

2968

52.07

YES

 

 

 

 

38

3080

50.8

NO

 

 

 

 

38

3388

49.53

NO

 

 

 

 

38

4368

57.15

NO

 

 

 

 

40

3612

53.34

NO

 

 

 

 

39

3024

53.34

NO

 

 

 

 

37

2968

50.8

YES

 

 

 

 

34

2436

43.18

NO

 

 

 

 

42

5264

57.15

YES

 

 

 

 

40

4788

43.34

NO

 

 

 

 

40

3500

45.72

NO

 

 

 

 

40

3668

53.34

YES

 

 

 

 

40

3696

45.72

YES

 

 

 

 

40

3556

48.26

YES

 

 

 

 

39

4256

53.34

NO

 

 

 

 

37

3640

53.34

NO

 

 

 

 

38

2912

49.53

YES

 

 

 

 

39

4256

45.72

NO

 

 

 

 

39

4312

55.88

NO

 

 

 

 

40

4760

58.42

NO

 

 

 

 

32

2296

53.34

YES

 

 

 

 

37

2940

55.88

NO

 

 

 

 

40

4060

53.34

NO

 

 

 

 

39

4172

50.8

NO

 

 

 

 

30

1980

46.13

YES

 

 

 

 

30

1896

45.72

YES

 

 

 

 

38

2968

53.34

NO

 

 

 

 

38

2688

53.34

NO

 

 

 

 

38

4200

53.34

NO

 

 

 

 

38

3920

53.34

NO

 

 

 

 

35

2576

45.72

NO

 

 

 

 

35

2744

46.99

NO

 

 

 

 

38

3864

53.34

NO

 

 

 

 

39

2912

48.26

NO

 

 

 

 

37

3668

54.61

NO

 

 

 

 

42

3640

49.53

NO

 

 

 

 

40

3864

53.34

NO

 

 

 

 

40

3556

52.07

NO

 

 

 

 

39

2800

50.8

YES

 

 

 

 

37

2688

49.53

YES

 

 

 

 

41

3976

52.07

YES

 

 

 

 

37

2688

45.72

YES

 

 

 

 

35

2002

45.72

YES

 

 

 

 

38

3108

48.26

YES

 

 

 

 

40

2030

48.26

YES

 

 

 

 

40

3304

48.26

YES

 

 

 

 

40

2912

45.72

YES

 

 

 

 

 

 

 

 

 



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Due By (Pacific Time) 03/11/2013 12:00 am
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