STAT 350 (Fall 2015)
HW 4 Questions
1. Written. In each of the situations, is it reasonable to use a binomial distribution for the
random variable? Please explain your answer on another sheet of paper.
In a random sample of students in a fitness study, Le
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
52) Test the null hypothesis of independence of the two classifications, A and B, of the 3 3
contingency table shown below. Test using = .01.
A
A1
B1
B
B2
B
48) In an exit poll, 45% of voters said that the main issue affecting their choices of candidates
was the economy, 35% said national security, and the remaining 20% were not sure.
Suppose we select one of the voters who participated in the exit poll at ra
4) A bag of candy was opened and the number of pieces was counted. The results are shown in the
table below:
4)
Color Number
Red
25
Brown
20
Green
20
Blue
15
Yellow
10
Orange
10
Find the probability that a randomly chosen piece of candy is not blue or red
Homework 10 (49 points)
(26 points LaunchPad + 23 points work + 2 points Bonus)
due Tuesday Nov. 17:11:55 pm
(1 pts. + 2 pts. BONUS) 1 (Problem 1.1). Written. In a one-way ANOVA, the k population
variances are assumed equal.
A. True
B. False
True. Populat
19) Inc. Technology reported the results of consumer survey in which 300 Internet users indicated their
level of agreement with the following statement: "The government needs to be able to scan Internet
messages and user communications to prevent fraud an
181) The data below represent the numbers of absences and the final grades of 15 randomly
selected students from a statistics class. Construct a scattergram for the data. Do you detect
a trend?
Student
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Number of Absence
39) Inc. Technology reported the results of consumer survey in which 300 Internet users indicated their
level of agreement with the following statement: "The government needs to be able to scan Internet
messages and user communications to prevent fraud an
STAT 350 (Fall 2015)
HW 10 Questions
1. (1.1) Written. In a one-way ANOVA, the k population variances are assumed equal.
True
False
BONUS: On a separate piece of paper show that SST = SSE + SSA.
2.
(2.1)
A one-way ANOVA can be used only when there are two
R Tutorial for STAT 350 Lab 6
Author: Leonore Findsen, Chunyan Sun, Sarah H. Sellke, Jeremy Troisi
1. T Procedure for One Population
The same function, t,test(), is used for both the confidence interval and hypothesis test.
In this tutorial, there will be
Solve the problem.
72) An academic advisor wants to predict the typical starting salary of a graduate at a top business
school using the GMAT score of the school as a predictor variable. A simple linear regression of
SALARY versus GMAT using 25 data point
123) A certain HMO is attempting to show the benefits of managed care to an insurance company. The
HMO believes that certain types of doctors are more cost-effective than others. One theory is that
certification level is an important factor in measuring t
R Tutorial for STAT 350 Lab 5
Author: Leonore Findsen, Chunyan Sun, Sarah H. Sellke, Jeremy
Troisi
1. Confidence Interval for One Population
To have R calculate a confidence interval, we use the t.test() command. As can be
seen by name this uses the t tes
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
93) A company keeps extensive records on its new salespeople on the premise that sales should
increase with experience. A random sample of seven new salespe
Homework 3 (61 points)
(34 LaunchPad + 27 points work + 1 points BONUS)
due Tuesday Sept. 22:11:55 pm
(3 pts. + 3 points work) Problem 1. Written. In each of the situations, is it reasonable to
use a binomial distribution for the random variable? Please e
Homework 1 (22 points)
(13 (HW1) + 7(Syllabus) + 2 points work)
due September 1st 11:55 pm
(1 pts.) Problem 1 n the four steps of statistical inference, the claim is BEST described
as:
A. the status quowhat we assume to be true.
B. the likelihood of occur
88) A bottling company produces bottles that hold 8 ounces of liquid. Periodically, the company gets
complaints that their bottles are not holding enough liquid. To test this claim, the bottling company
randomly samples 21 bottles and finds the average am
182) The scores of nine members of a women's golf team in two rounds of tournament play are
listed below.
182)
Player
1 2 3 4 5 6 7 8 9
Round 1 85 90 87 78 92 85 79 93 86
Round 2 90 87 85 84 86 78 77 91 82
Construct a scattergram for the data.
Answer:
MUL
23) An adverse drug effect (ADE) is an unintended injury caused by prescribed medication. The table
summarizes the proximal cause of 95 ADEs that resulted from a dosing error at a Boston hospital.
23)
WRONG DOSAGE USE
NUMBER OF ADEs
(1) Lack of knowledge
STAT 350 (Fall 2015)
HW 8 Questions
1. The hypothesis test concerning a population mean can only be used when the
underlying population is normal.
True
False
2. In general, we reject the null hypothesis in a test concerning a population mean when the
valu
STAT 350 (Fall 2015)
1.
HW 5 Questions
Written. If X is a uniform distribution defined over the interval (a,b) verify that
a) E(X)=(a+b)/2. Please show your work.
b) BONUS: Var(X)=(ba)^2 /12. Please show your work.
Written. Premanufactured wooden roof tru
Homework 5 (36 points)
(25 points LaunchPad + 11 points work + 2 points BONUS)
due Tuesday Sept. 29:11:55 pm
(4 pts. + 3 pts work + 1 pt BONUS) Problem 1. Written.
Step 1: If X is a uniform distribution defined over the interval (a,b) verify that
+
.
a) (
175) The probability distribution shown below describes a population of measurements.
175)
x
0
2
4
p(x) 1/3 1/3 1/3
Suppose that we took repeated random samples of n = 2 observations from the population
described above. Which of the following would repres
20) Consider the following pairs of measurements:
x
y
a.
b.
c.
1
3
3
6
4
8
20)
6
12
7
13
Construct a scattergram for the data.
What does the scattergram suggest about the relationship between x and y?
Find the least squares estimates of 0 and 1.
d.
Plot t
STAT 350 (Fall 2015)
1.
HW 6 Questions
The administration at the University of Nebraska in Lincoln is interested
in student reaction to a planned parking garage on campus. A dormitory
near the proposed site is selected and several Student Senate members
v
Homework 8 (43 points)
(22 points LaunchPad + 21 points work)
due Tuesday Oct. 27:11:55 pm
(1 pts.) 1 (Problem 1.1). The hypothesis test concerning a population mean can only be
used when the underlying population is normal.
A. True
B. False
False. In thi
Homework 6 (35 points)
(23 points LaunchPad + 12 points work + 3 points BONUS)
due Tuesday Oct. 6:11:55 pm
(1 pts. Problem 1 Part 1 (1.1). The administration at the University of Nebraska in Lincoln
is interested in student reaction to a planned parking g
Homework 2 StatsPortal (16.5 points)
(13 points StatsPortal + 3.5 points work)
due Tuesday Sept. 9 11:55 pm (online), Wednesday in class for
hardcopy
(4 pts.) 1. Problem 1. Here are the total scores of 10 students in an introductory statistics
course.
Pre
Homework 7 (34 points)
(19 points LaunchPad + 15 points work + 1 point BONUS)
due Tuesday Oct. 20:11:55 pm
(1 pts.) 1 (Problem 1.1). A statistic is an unbiased estimator of if E( ) = .
A. True
B. False
True. This is the definition of an unbiased estimator