1 0-3 Regression 503
.
a Regressm" Prediction Worth
Key Concept Suppose that we have a collection of paired data and we use the methods
of Section 102 to conclude that there is a linear correlation between two variables. This
section presents methods for
1 1 -3 Centingency Tables 54?
21. Enter the obServed frequencies in the preceding table.
b. Assuming a normal distribution with mean and standard deviation given by the sample
mean and standard deviation, use the methods of Chapter 6 to find the probabili
560 Chapter 1 1 Chi-Square and Analysis of Variance
19. Clinical Trial of Lipitor Lipitor is the trade name of the drug atorvastatin, which is used
to reduce cholesterol in patients. (Until its patent expired in 2011, this was the largestselling
drug in t
1 1 Chi-Square and
- . Analysis of Variance
534 chapter Are four quarters the
Women) same as one dollar?
Are four quarters the same as one dollar? There
may be a temptation to answer yes and move on to the next chapter. Using our extensive
knowledge base
518 Chapter 10 Correlation and Regression
'I:l' Rank Correlation
Key Concept In this section we describe the nonparametric method of the rank
correlation test, which uses ranks of paired data to test for an association between
two variables. In Section 10
1 0-3 Regression 513
Because of the messy calculations involved, the linear correlation
coefficient r and the slope and yintercept of the regression line are
usually found using a calculator or computer software.
S _T A T D I S K First enter the paire
Ch. 7 Estimates and Sample Sizes
1. The mean and standard deviation, respectively, of students working after school are
17.6h and 9.3h. The given statistics are based on a sample size of 50 drawn from a
normally distributed population.
a. Find the best po
570 Chapter 1 1
Interpretation
ChiSquare and Analysis of Variance
3 Although the analysis of variance test tells us that at least one of the means is dif
3 ferent from the others, the Bonferroni test results do not identify any one par
.i.-.-.,
.g.-.
nun.
1 1 -2 Goodness~ofFit 543
S T A T D I S K First enter the observed frequencies in the first
column of the Data Window. if the expected frequencies are not all
>equal, enter a second column that includes either expected propor
ns or actual expected frequen
Chapter 1 Quick Quiz 35
Chapter 1 Review
The single most important concept presented in this chapter is to recognize that when one
is using methods of statistics with sample data to Form conclusions about a population, it
is absolutely essential to coll
Chapter 3 Statistics for Describing, Exploring, & Comparing Data
1. For men aged between 18 and 24 years, serum cholesterol levels (in
/100 ) have a
mean of 178.1 and a standard deviation of 40.7 Find the score corresponding to a male,
aged 18-24 years,
Ch.4 Probability
1. The table below describes the smoking habits of a group of asthma suffers.
Nonsmoker
Occasional
Smoker
Men
344
Women
370
Total
714
a. If one of the 1045 people is
a man or a heavy smoker.
Regular
Smoker
Heavy
Smoker
Total
40
85
39
508
Ch. 8 Hypothesis Testing
1. 12 organizations have a mean cost per client of $2,133 and a standard deviation of
$345. At the 0.01 significance level, test the claim of a critic who complains that the
mean for all such organizations exceeds $1800 per client
Ch. 5 Discrete Probability Distributions
1. When you give a casino $5 for a bet on the pass line in the game of craps, there is a
probability that you will win $5 and a
probability that you will lose $5. What is
your expected value? In the long run, how m
Ch. 6 Normal Probability Distributions
Lets take a closer look at probability!
1. On one measure of attractiveness, scores are normally distributed with a mean of
3.93 and a standard deviation of 0.75. Find the probability of randomly selecting a
subject