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 boxandwhisker 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 StemandLeaf 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 nonsmoker. Explain!
9) Create s a scatter plot comparing the gestation period with the height of the infant at birth.
Click on Graphics >> Scatter Plot >> Xvariable: Gestation Period , YColumn: 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 








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