10/2/2015
Chapter 2: Displaying and summarizing a single variable
Problem 1: diet and prostate cancer revisited
a) This is a bivariate study. The two variables are the level of fish consumption and the presence
of prostate cancer.
b)
Fish consumption for
CHAPTER 5: PROBABILITY
4. Problem 4
Let A be the set of all American men with high cholesterol, let B be the set of all American
men with high blood pressure, and let S be the set of all American men.
4.1. Part (a). We have P (A) = 1
#(Ac B c ) + #B #(A
Homework 3
October 9, 2015
Chapter 3: Displaying and summarizing relationships between two variables
Problem 1: Antidepressants and bone injury
14
=10.2 of them experienced fractures.
a) Of all the daily SSRI users,
137
244
=5.1 of them experienced fractu
Vocabulary
Statistic: a summary calculated from a sample.
Parameter: characteristic of a pop., corresponds to a statistic.
5# summary: min, Q1, median, Q3, max.
Residual: difference between predicted and actual values.
Retrospective study: draw conclusion
Vocabulary
Statistic: a summary calculated from a sample.
Parameter: A quality or quantity present in a population.
Joint distribution: a distribution showing counts for each
combination of two categorical variables.
Marginal distribution: the distributio
Homework 3
October 16, 2015
Problem 3.10: Nutrition continued
a) A linear regression for the data is ^y i=89.65+2.485 x i .
b) The linear regression predicts that a cereal with 12 grams of sugar would have
89.65+2.485 ( 12 )=121.96 calories.
c) If Lucky C