Class Activity 2
Probability Problems A answers
1. Barry Bonds Probability of a Home Run.
In the 2001 season, Barry Bonds hit 73 home runs in 476 times. Therefore,
P(home run) =
73
=0.15336
476
From his 567 career home runs in 7932 at bats , P(home run) =
Fast-food wars heat up in Indonesia
In the heart of the vast plantation belt that stretches across Indonesias resource-rich
Sumatra island, Kentucky Fried Chicken is fighting for market share.
Facing growing competition from Burger King and McDonalds as w
8-1
Review and Preview
8-2
Basics of Hypothesis
Testing
8-3
Testing a Claim About
a Proportion
8-4
Testing a Claim About
a Mean: s Known
8-5
Testing a Claim About
a Mean: s Not Known
8-6
Testing a Claim About
a Standard Deviation
or Variance
Hypothesis Te
Chapter 9
Inferences from Two Samples
9-2 Inferences About Two Proportions
1. There are two requirements for using the methods of this section, and each of them is violated.
(1) The samples should be two sample random samples that are independent. These s
Chapter 10
Correlation and Regression
10-2 Correlation
1. a. r = the correlation in the sample. In this context, r is the linear correlation coefficient
computed using the chosen paired (points in Super Bowl, number of new cars sold) values
for the random
Chapter 12
Analysis of Variance
12-2 One-Way ANOVA
1. a. One-way analysis of variance is appropriate for these data because they represent three or
more populations categorized by a single characteristic that distinguishes the populations
from each other.
Chapter 2
Summarizing and Graphing Data
2-2 Frequency Distributions
1. No. The first class frequency, for example, tells us only that there were 18 pennies with
weights in the 2.40-2.49 grams class, but there is no way to tell the exact values of those 18
Chapter 1
Introduction to Statistics
1-2 Statistical Thinking
1. A voluntary response sample, also called a self-selected selected, is one in which the subjects
themselves decide whether or not to participate in the study.
2. A voluntary response sample i
Chapter 6
Normal Probability Distributions
6-2 The Standard Normal Distribution
1. The word normal as used when referring to a normal distribution does carry with it some of
the meaning the word has in ordinary language. Normal distributions occur in natu
Chapter 8
Hypothesis Testing
8-2 Basics of Hypothesis Testing
1. Given the large sample size and the fact that 20% is so much less than 50%, it is apparent that
any confidence interval for the proportion of bosses that are good communicators would fall
en
Chapter 4
Probability
4-2 Basic Concepts of Probability
1. To say that the probability of being injured while using recreation equipment in 1/500 means
that approximately one injury occurs for every 500 times that recreation equipment is used.
Note that t
Chapter 7
Estimates and Sample Sizes
7-2 Estimating a Population Proportion
1. The confidence level was not stated. The most common level of confidence is 95%, and
sometimes that level is carelessly assumed without actually being stated.
2. The margin of
Chapter 3
Statistics for Describing, Exploring, and Comparing Data
3-2 Measures of Center
1. The mean, median, mode, and midrange are measures of center in the sense that they each
attempt to determine (by various criteria i.e., by using different approac
Chapter 5
Discrete Probability Distributions
5-2 Random Variables
1. As defined in the text, a random variable is a variable that takes on a single numerical value,
determined by chance, for each outcome of a procedure. In this exercise, the random variab