Midterm Exam 111
Stat 251 Fall 2006
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TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false.
Answer the question True or False.
1) ln skewed distributions, the mean is less affected by extreme ob

Stat 252 winter2015
2nd edition: Chapter16.6-16.7;
17 Prediction and Confidence Intervals
1
3rd edition: Chapter 15.3-15.4
Goal of Regression Analysis: There are TWO main goals of regression analysis:
1) Use the estimated slope to describe the association

Stat 252 winter2015
2nd edition: Chapter16.6-16.7;
17 Prediction and Confidence Intervals
1
3rd edition: Chapter 15.3-15.4
Goal of Regression Analysis: There are TWO main goals of regression analysis:
1) Use the estimated slope to describe the association

Stat252 winter2015
#16 Assumptions Linear Regresion:16.2, 17.3.17.4 1
Recall, the formula for the regression model:
y = 0 + 1 x + =y|x+
Checking the Regression Conditions
The assumptions of the linear regression model are:
y and x have a linear_ relatio

Stat252 winter2015
21 Assumptions Multiple Regression -: 2nd edition: 18.3, 19.3 and 3rd edition: 17.3, 18.31
Checking Assumptions in Multiple Regression
Popultioan Multiple Regression Model with k Independent Variables:
Yi 0 1X1i 2 X 2i k X ki
The assum

STAT 252 Fall 2014
#19-20 Multiple Regression (2d: chapter18.1-18.5; 3rd: chapter 17.1-17.5)
Multiple Regression Analysis
1
Most practical applications of regression analysis utilize models that are more complex than the simple straight-line model.
We exp

STAT 252 winter2015
19-20 Multiple Regression (2nd edition: Ch18.1-18.5; 3rd edition: Ch 17.1-17.5)
1
Multiple Regression Analysis
Most practical applications of regression analysis utilize models that are more complex than the simple straight-line model.

Name _
Worksheet 11
(Hypothesis testing)
1. An inventor has developed a new, energy-efficient lawn mower engine. He claims that
the engine will run continuously for 5 hours (300 minutes) on a single gallon of regular
gasoline. From his stock of 2000 engin

Solutions to Final Exam Practice Questions
STAT 251, Prof. Walker
1.
1
(a) = mean travel time to work for all employees at this company
Conditions:
1. randomization: OK, random sample
2. sample 10% of population: OK if company has at least 240 employees
3

Confidence Intervals for Proportions
1. Margin of error. A TV newsman reports the results of a poll
of voters, and then says, "The margin of error is plus or
minus 4%." Explain carefully what that means.
2. Margin of error. A medical researcher estimates

Hypothesis Testing for Proportions
Statistical Significance vs. Practical Significance
Outline
1
Hypothesis Testing for Proportions
2
Statistical Significance vs. Practical Significance
Hypothesis Testing for Proportions
Statistical Significance vs. Pract

Name _
Worksheet 10
1. What is the purpose of a confidence interval?
2. What is the SE(pp )? How does it difer from SD( pp)? For what situatons do we use SE and for
what situatons do we use SD?
3. What are the assumptons we need to check before performing

Name _
Worksheet 9
1. What best describes what our attitude about sampling error should be?
a. Must be avoided at all costs.
b. Is a natural part of inferential statistics.
2. Suppose that combined math and verbal SAT scores for high school students takin

Confidence Interval Conclusion Practice
1. The American Association of Advertising Agencies is studying the amount of time a 30-minute
prime-time TV show spends on non-programming time (commercials). A sample of 25 prime
time shows yielded a sample mean

Confidence Interval Conclusion Practice
1. The American Association of Advertising Agencies is studying the amount of time a 30-minute
prime-time TV show spends on non-programming time (commercials). A sample of 25 prime
time shows yielded a sample mean

Hannah Vaughn-Hulbert
STAT 251
Oct. 20, 2016
Mini Project 2
My mini project two is based on the association between levels of education and the
number of drinks consumed over a period of one week. My question is: Does the level of ones
education impact we

1. Insurance companies collect annual payments from homeowners in exchange for paying to rebuild houses that
burn down. For example, a homeowner might pay $300 in order to receive up to $300,000 from the insurance
company to replace a house that burns dow

Practice Questions for Exam 2: STAT 251, Fall 2013, Prof. Walker
The exam covers Ch. 7, 8 (except 8.3), 9 (except 9.4 and 9.5), and Sections 24.10 and 24.11. In Ch. 8 and 9, only the
Geometric, Binomial, Hypergeometric, Uniform, and Normal were covered. Y

Quiz 113 Stat 251
Name
\
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Solve the problem.
1) A local eat-in pizza restaurant wants to investigate the possibility of starting to deliver pizza

Exam #2 Stat 251
Winter 2006
Namt
Solve the problem.
2. (i) We know that the sam
devration. The center
' g center wants to determine the proportion of business students who
ave personal computers (PCs) at home. If the proportion diff
2: 2 . <o= .

STAT 251: STATISTICAL INFERENCE FOR MANAGEMENT I
EXAM #3 Review Solutions
These questions do NOT cover all of the material for Exam #3. Do not restrict your studying to just
these problems. You should review the homeworks, handouts, practice problems, and

STAT 251: STATISTICAL INFERENCE FOR MANAGEMENT I
EXAM #3 Review Solutions
These questions do NOT cover all of the material for Exam #3. Do not restrict your studying to just
these problems. You should review the homeworks, handouts, practice problems, and

STAT 251: STATISTICAL INFERENCE FOR MANAGEMENT I
EXAM #2 Review Questions
These questions do NOT cover all of the material for Exam #1. Do not restrict your studying to just
these problems. You should review the homeworks, handouts, practice problems, and

STAT 251
Solutions: Homework Assignment #3
Problems:
Chapter 5: See below for #1 and #2, Book: 6, 7, 9, 11, 12, 26, 34, 36, 39, 40
1. Pizza Discount. A local pizza restaurant has a spinner with 6 spaces on it. The spaces are the same size
(1/6 of the whee

STAT 251
Solutions: Homework Assignment #4
Problems:
Chapter 5: 16 (you may want to work on this problem after we cover Bayes Rule), 42, 47, 48, 49 (you may
want to work on this problem after we cover Bayes Rule), 54, 58, 60, 63, 68
Lies
OR
49.
a.
Contrac

STAT 251
Homework Assignment #7
TEMPLATE
Chapter 9
14) A survey of 200 students is selected randomly on a large university campus. They are asked if they use a
laptop in class to take notes. The result of the survey is that 70 of the 200 students responde

STAT 251
Homework Assignment #6
TEMPLATE
Chapter 6
1) A pharmaceutical company has developed a drug to restore hair growth in men. Like most drugs, this
product has potential side effects. One of these side effects is increased blood pressure. The FDA has