Solutions Homework 3
5.4 Fear of flying?:
a) This would be considered a long run of trials. A long run refers to many, many
trials. 31 million flights certainly would qualify as many trials.
b) The pr
Probability - Solutions
1.1 Situation: The High School and Beyond data is from a large-scale longitudinal study
conducted by the National Opinion Research Center (1980) under contract with the
Nationa
Hypothesis Testing Proportion and One Mean - Solutions
P-value Guidelines when using Standard Normal Table (i.e. the Z-table):
Keep this in mind: The method for finding the p-value is based on the alt
Chapter 6: Probability
Distributions
Section 6.1: How Can We Summarize
Possible Outcomes and Their
Probabilities?
1
Learning Objectives
1. Random variable
2. Probability distributions for discrete ran
Chapter 14: Comparing
Groups: Analysis of Variance
Methods
Section 14.1
How Can We Compare Several Means?
ANOVA
1
Learning Objectives
1.
2.
3.
4.
5.
6.
7.
8.
Analysis of Variance
Hypotheses and Assump
Chapter 12: Analyzing
Association Between
Quantitative Variables:
Regression Analysis
Section 12.1: How Can We Model How Two
Variables Are Related?
1
Learning Objectives
Regression Analysis
The Scatte
Chapter 11: Analyzing the
Association Between
Categorical Variables
Section 11.1: What is Independence and What is
Association?
1
Learning Objectives
1. Comparing Percentages
2. Independence vs. Depen
Chapter 8: Statistical
Inference: Confidence
Intervals
Section 8.1
What are Point and Interval Estimates of
Population Parameters?
Learning Objectives
1. Point Estimate and Interval Estimate
2. Proper
Chapter 3
Association: Contingency,
Correlation, and Regression
Section 3.1
How Can We Explore the Association
between Two Categorical Variables?
Learning Objectives
1. Identify variable type: Respons
Chapter 5
Probability in our Daily
Lives
Section 5.1: How can Probability
Quantify Randomness?
Learning Objectives
1. Random Phenomena
2. Law of Large Numbers
3. Probability
4. Independent Trials
5. F
Chapter 7: Sampling
Distributions
Section 7.1
How Likely Are the Possible Values of a
Statistic? The Sampling Distribution
Learning Objectives
1. Statistic vs. Parameter
2. Sampling Distributions
3. M
Chapter 8: Statistical
Inference: Confidence
Intervals
Section 8.1
What are Point and Interval Estimates of
Population Parameters?
Learning Objectives
1. Point Estimate and Interval Estimate
2. Proper
Displaying Data - Solutions
1.1 Suppose a medical researcher compares the average blood pressures of women who take oral
contraceptives to the blood pressures of women who do not.
a. Is blood pressure
Solutions Homework 1
2.3 Identify the variable type:
a) quantitative
b) categorical
c) categorical
d) quantitative
2.6 Discrete or continuous?:
a) continuous
b) discrete
c) continuous
d) discrete
2.8
Solutions Homework 2
4.5 School testing for drugs:
Although this study found similar levels of drug use in schools that used drug testing and schools that did
not, lurking variables might have affecte
Sampling - Solutions
Activity 1.1
Non-response bias refers to a bias that occurs if people with a particular opinion or trait tend to refuse
to answer certain survey questions (or possibly refuse to p
Lesson 4 Homework Solutions
6.3 Boston Red Sox hitting:
a) The probabilities give a legitimate probability distribution because each one is
between 0 and 1 and the sum of all of them is 1.
b) = 0P(0)
Chapter 2: Exploring Data
with Graphs and Numerical
Summaries
Section 2.1: What Are the Types of Data?
1
Learning Objectives
1. Know the definition of variable
2. Know the definition and key features
Chapter 1:Statistics: The Art
and Science of Learning
from Data
1.1: How Can You Investigate Using Data?
1.2: We Learn about Populations Using Samples
1.3: What Role Do Computers Play in Statistics?
S
Lesson 5 Homework Solutions
7.6 Exit poll and n:
a) The interval of values within the sample proportion will almost certainly fall
within three standard errors of the mean: 0.53 to 0.59.
b) Based on t
Sampling Distributions Solutions
1 Suppose that medical researchers want to estimate the true proportion of all teenagers with
high blood pressure whose blood pressure would decrease if they took calc
Confidence Intervals Proportion and One Mean
1 The term sampling frame refers to the group that actually had a chance to get into the sample. Ideally,
this is the same as the population of interest, b
Lesson 6 Homework Solutions
8.6 Starting salaries:
a) The point estimate is the mean of the salaries of the sample of three students: $45,000.
b) The interval would be: 20,200 to 69,800. It includes a
Statistical Ideas and Methods Test Bank
Chapter 6
Questions 1 to 4: The table below shows the counts by gender and highest degree attained for 498 respondents in
the General Social Survey.
Male
Female
Lesson 7 Homework Solutions
9.4 Iowa GPA:
H 0 : = 2.80
Ha :
2.80
In the above hypotheses, H 0 : is the notation for the null hypothesis, H a : is the notation for the
alternative hypothesis, and is th
Hypothesis Testing Comparing Two Groups - Solutions
1 For each of the following research questions does the situation or research question involve
independent samples or paired data?
a. Twenty-five pe
Lesson 8 Homework Solutions
10.1 Wealth gap:
a) The response variable is net worth and the explanatory variable is race.
b) The two groups that are the categories of the explanatory variable are white
Lesson 9 Homework Solutions
14.1 Hotel satisfaction:
a) The response variable is the performance gap, the factor is which hotel the guest
stayed in, and the categories are the five hotels.
b) H 0 : 1
Analysis of Variance (ANOVA) - Solutions
One-way analysis of variance is a method for comparing several population means, when the
data are from independent samples. It can be thought of as a tool for