Statistics HW 2

Statistics HW 2 - Question 1 0.25 out of 0.25 points...

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Question 1 0.25 out of 0.25 points Description The purpose of this assignment is to have you learn how to construct box plots, compare two populations, to calculate your first probability problems using the empirical rule, and to understand the information about Gaussian (Normal) Distributions. Instructions The data set being used is the DNA adduct level data for the distal part of the colon. The following is the basic description of the Adduct Data. These data were generated in the laboratory of Dr. Joanne Lupton at Texas A&M University. Two diet groups were formed. One group was fed a diet rich in fish oil, while the other was fed a diet rich in corn oil. It is thought that diets rich in corn oil promote colon cancer. 15 rats in each group were studied. They were exposed to a potent carcinogen (AOM). For each rat, roughly 20 colonic crypts were selected. Within each colonic crypt, individual cells were then selected. The variable measured was the mean DNA adduct level in colonic crypts, over all crypts and cells within crypts. The adduct level is roughly a measure of DNA damage. The idea is to see if the fish-oil enhanced diet group had less damage (smaller adduct levels) than the corn-oil enhanced diet group. DNA adduct levels were measured in the proximal (front) part of the colon and in the distal (back) part of the colon. It is of interest to understand whether DNA damage has different behavior in different parts of the colon. If you have forgotten how to compute descriptive statistics using Minitab, the steps are: • Select Stat/Basic Statistics • Select Display Descriptive Statistics • Place dependent variable in the Variable Box (top). • Place factor in the factor box (By Variables) • Select Statistics and then select the needed options. • Select graphs and select the needed graphs (i.e. histogram, boxplot) • Select OK Open up the following DNA adduct level dataset from the Blackboard datasets. Write down the variable names. Use the exact names as given in the Minitab file. The variables are, in order from left to right in the Minitab worksheet, [a] , [b] , and [c] .

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Specified Answer for: a diet Specified Answer for: b proxim al Specified Answer for: c distal Correct Answers for: a Evaluation Method Correct Answer Pattern Match diet Correct Answers for: b Evaluation Method Correct Answer Pattern Match proximal Correct Answers for: c Evaluation Method Correct Answer Pattern Match distal Question 2 0.25 out of 0.25 points What is the sample mean for the corn oil diet, in the distal part of the colon (report values as given in the Session window)? Selected Answer: 29. 60 Correct Answer: Evaluation Method Correct Answer Pattern Match 29.60 Question 3 0.25 out of 0.25 points What is the sample standard deviation for the corn oil diet in the distal part of the colon (report values as given in the Session window)?
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