# 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

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