Homework Chapter 9
1. Using the data from 9.1Include the relevant output in your document/homework.Enter the data into SPSS. Make sure you name and label your variables.Make a scatterplot for Y& X1; and Y&X2Discuss the scatterplots based on how they appear….Conduct correlations for all 3 variables at onceWrite up the results of the correlation analysisConduct a regression analysis for each variable pairWrite up the results of the analysis (include the formula for the line)Draw the line on your scatter plot.Discuss how well you think the line fits your data (goodness of fit)
2. Repeat the above for 9.273.
3. Exercise 9.31; and 9.32 examine the relationship between weight and height for men (9.31) and women (9.32).Enter the data into SPSS using a column for sex, height, and weight. When you analyze subpopulations use the select case to select men or women.Make a scatter plot for the combined data, and one each sex (so you will have three)Discuss the scatterplots individually, then compare and contrast two scatterplots for the sub samples. Are they the same or different? How do they compare to the scatterplot for the over all data?Next compute r for the overall data and then for the subsamples?Discuss your findings. (Make sure you include in your discussion issues related to the assumptions for correlation and regression plus the factors that affect correlation).This is the sort of thing I will ask you to do on the next exam.Let me know if you have any questions,
--Dr. M
posted by maclin_uni @ 1:50 PM
4 Comments:
Dr. MacLin-
Some of us are finding that the homework due tomorrow is taking a really long time. We're also having trouble with the second part of the assignment. How are we to do a scatterplot with a string variable (region). It's not making any sense.
For the second part of the homework we compared the expenditure rates. Is that right?
In 9.27 the variables of interest are alcohol and tobacco. Region is just like a subject number or something indicating where the data came from. This is my point about making sure the analysis is meaningful.
Sorry I wasn't more clear. I hope this helps,
--Dr. M
For the second part of the homework we compared the expenditure rates. Is that right?
Correct.
--Dr. M
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