Lecture #8 Additional Practice Problems
(1) At a retail shop four employees are responsible for handling the cash register. One item that needs to
be recorded for each sale is the type of payment: cash, check, or credit card. For a number of transactions

Lecture 4 Additional Practice - Solutions:
1) The following hypotheses will be tested using a 5% significance level and a sample
size of 36. Assume the primary variable of interest can be modeled using the Normal
distribution with a standard deviation of

Lecture #5 - Practice Problems
(1) Which of the following statements is false?
a. The t - distribution is symmetric about zero
b. The t - distribution is more spread out than the standard normal distribution
c. As the degrees of freedom get smaller, the t

Lecture #5 - Additional Practice Problems - Solutions
(1) Which of the following statements is false?
a. The t - distribution is symmetric about zero
b. The t - distribution is more spread out than the standard normal distribution
c. As the degrees of fre

Lecture #6 Additional Practice Problems
(1) Consider the following hypothesis test:
Ho: 1 2 = 1.7
n1 = 20
X 1= 25.2
H1: 1 2 1.7
n2 = 35
X 2= 20.4
s1= 4
= 0.05
s2= 7
a. What is the appropriate test statistic (Z or t)? If t, also indicate the degrees of fr

Lecture #6 Additional Practice Problems - S olutions
(1) Consider the following hypothesis test:
Ho: 1 2 = 1.7
n1 = 20
X 1= 25.2
H1: 1 2 1.7
n2 = 35
X 2= 20.4
s1= 4
= 0.05
s2= 7
a. What is the appropriate test statistic (Z or t)? If t, also indicate the

Lecture #7 Additional Practice Problems
(1) After calculating the sample size needed to estimate a population proportion to within 0.04, your
statistics professor told you the maximum allowable error must be reduced to just .01. If the original
calculatio

Lecture #7 Additional Practice Problems - Solutions
(1) After calculating the sample size needed to estimate a population proportion to within 0.04, your
statistics professor told you the maximum allowable error must be reduced to just .01. If the origina

Lecture #8 Additional Practice Problems - Solutions
(1) At a retail shop four employees are responsible for handling the cash register. One item that needs to
be recorded for each sale is the type of payment: cash, check, or credit card. For a number of t

Lecture #13 Additional Practice Problems
1) The following regression results are for a model to predict monthly household expenditure on
groceries (in $s) using annual household income (in $1,000s) and household neighborhood (0 =
suburban, 1 = rural) as p

Lecture #13 Additional Practice Problems - Solutions
1) The following regression results are for a model to predict monthly household expenditure on
groceries (in $s) using annual household income (in $1,000s) and household neighborhood (0 =
suburban, 1 =

Lecture 15 - Additional Practice
(1) Which of the following does not constitute a time series?
a. the number of kilowatts of electricity used by a firm each week last year
b. the daily high temperature in a city for the past month
c. annual revenues last

Lecture 15 - Additional Practice Solutions
(1) Which of the following does not constitute a time series?
a. the number of kilowatts of electricity used by a firm each week last year
b. the daily high temperature in a city for the past month
c. annual reve

Lectures #9 and #10 Additional Practice Solutions
1. Use the following data to construct the One-Way ANOVA Summary Table, and to perform the
F-test to determine if there is evidence that the population means are not all equal.
Data:
Treatment 1
5
3
3
5
X1

Lecture #4 Additional Practice
1) The following hypotheses will be tested using a 5% significance level and a sample
size of 36. Assume the primary variable of interest can be modeled using the Normal
distribution with a standard deviation of 12. If th e

Lecture #3 Practice Problems - Solutions
1) A professor of statistics refutes the claim that the average student spends 3 hours studying for
the midterm exam. Which hypothesis is used to test the claim?
a. H 0 : X 3 vs. H 1 : X 3
b. H 0 : X 3 vs. H 1 : X

Lecture #3 - Practice Problems
1) A professor of statistics refutes the claim that the average student spends 3 hours studying for
the midterm exam. Which hypothesis is used to test the claim?
a. H 0 : X 3 vs. H 1 : X 3
b. H 0 : X 3 vs. H 1 : X 3
c. H 0 :

First 5 letters of your last name
Last 5 digits of your Student Number (SSN)
Name: _
last
first
MI
Instructions:
You must use pencil to write your quiz.
Turn off all cell phones and pagers. You may not use cell phones or other PDA’s for any purpose
during

First 5 letters of your last name
Last 5 digits of your Student Number (SSN)
Name: _
last
first
MI
Instructions:
You must use pencil to write your quiz.
Turn off all cell phones and pagers. You may not use cell phones or other PDA’s for any purpose
during

First 5 letters of your last name OSU Dot Number
Name: _
last first MI
Recitation Day and Start Time: _
Instructions: You must use pencil to write your exam. Turn off all cell phones and pagers. You may not use cell phones or other PDAs for any purpose du

Lectures #9 and #10 Additional Practice
1. Use the following data to construct the One-Way ANOVA Summary Table, and to
perform the F-test to determine if there is evidence that the population means are not all
equal.
Data:
Treatment 1
5
3
3
5
X1= 4
2
S 1

Lectures #11 and #12 - Additional Practice
(1) A corporation administers an aptitude test to all new sales representatives. Management is
interested in the extent to which this test is able to predict their eventual success. The
accompanying table records

Lectures #11 and #12 - Additional Practice Solution
(1) A corporation administers an aptitude test to all new sales representatives. Management is
interested in the extent to which this test is able to predict their eventual success. The
accompanying tabl

Lecture #2 Additional Practice Problems
1) A nightclub is reviewing revenues for weekday nights. Management has determined
that to profit, they must have at least 50 patrons on a weekday night. The following
sample data for the number of patrons on weekda

Lecture #1 Additional Practice
1) The time to failure of a certain type of batteries is Normally distributed with a mean time to
failure of 28 months and a standard deviation of 2 months. I select a simple random sample of 4
batteries produced in the manu

Lecture #1 Additional Practice Answers/Solutions
1) The time to failure of a certain type of batteries is Normally distributed with a mean time to
failure of 28 months and a standard deviation of 2 months. I select a simple random sample of 4
batteries pr

Lecture #2 Practice Problems - Solutions
1) A nightclub is reviewing revenues for weekday nights. Management has determined
that to profit, they must have at least 50 patrons on a weekday night. The following
sample data for the number of patrons on weekd