Stat2120,TuesdayandThursday1:002:35pm
HOMEWORKASSIGNMENT3
DUEThursdayOctober6,2016
Please type your answer following each question and submit your work electronically to
CANVAS by the due date.
1.
Arecentsurveyof75workersfoundthat53ofthepeoplerodethebusto
Stat2120,TuesdayandThursday1:002:35pm
HOMEWORKASSIGNMENT5
DUETuesdayNovember17,2016
Please type your answer following each question and submit your work electronically to
CANVAS by the due date.
Please state clearly how you reach each answer. A numerical
STAT 2120 Homework #4 Answer Key
Sections 7.2 and 7.3
7.60 a)
Two-Sample T-Test and CI
Sample
N
Mean StDev
1
10 4.100 0.800
2
10
2.90
1.60
SE Mean
0.25
0.51
Difference = mu (1) - mu (2)
Estimate for difference: 1.200
95% CI for difference: (-0.022, 2.422)
STAT 2120 Homework #1 Answer Key
Section 6.1 Review
6.1
= = = 22
6.2 two standard deviations or $44
6.3 $44.
6.5 One-Sample Z
The assumed standard deviation = 112.08
N
453
Mean
405.02
SE Mean
5.27
95% CI
(394.70, 415.34)
Assumption/Required Condition: By
Sections 7.2 and 7.3 - Example 4 Write-up
OUTPUT FOR THE FOLLOWING STACKED DATA CODING: GROUP1 = 18-34, GROUP2 =35-50
To create the histograms shown below:
Graph Histogram With Fit OK
Graph variables: Times Multiple Graphs
By variables By variables with g
Sections 7.2 and 7.3 - Example 2 Write-up
It appears that the normality assumption is satisfied for both groups.
Test and CI for Two Variances: Teller 1, Teller 2
Method
Null hypothesis
Alternative hypothesis
Significance level
Sigma(Teller 1) / Sigma(Tel
Sections 7.2 and 7.3 - Example 3 Write-up
It appears that the normality assumption is satisfied for both groups.
a. Can we conclude that, using weight gain as our criterion, Tastee baby food is indeed superior?
Conduct a test using a 5% significance level
Section 7.1 - Part 2 - Class Example Write-ups
Example 4
Comment on graphs: The normality assumption appears to be valid based on both the histogram
and the normal probability plot. However, there is one outlier.
One-Sample T: Orders
Test of mu = 85 vs >
STAT 2120 Homework #3 Answer Key
Section 7.1
7.1 a) = = 19.5
b) n-1 = 15
7.2 The standard error would be smaller, as dividing by a larger value yields a smaller number. The
standard
error is = 15.6.
7.3
One-Sample T
N
Mean StDev
16 508.0
78.0
SE Mean
19.5
STAT 2120 Homework #5 Answer Key
Section 8.1
8.1 a) n = 760 b) x = 283; 283 of the banks plan to acquire another bank within five years.
c) = 283/760 = 0.3724
8.2 a) n = 1063 b) x = 223 c) = 263/1063 = 0.2098
8.3 a)
= 0.0175
b) 0.3724 (1.96)(0.0175) 0.372
STAT 2120 Exam 3 Wednesday, April 12
Please come to class early. You will be assigned a seat.
Exam 3 will include material from Sections 11.1-11.2, 12.2, 2.6, 3.4, 13.1 that we have covered
in class and in Homework Assignments #9, #10, and #11.
You may br
Stat2120,Tuesday(4/25)1:002:15pm
SampleReviewQuestions
Please complete your answer following each question and submit your work
electronically to CANVAS at the end of the class.
Please state clearly how you reach each answer to earn the whole credit. A nu
Tyler Rohe Homework 1
1. A way to select a random 6 companies out of the 18 in the stock market list is by given
them all a number and put all the numbers in a hat and randomly pulling out 6 numbers
and choosing those as your 6 companies.
2. In order to f
Stat2120,TuesdayandThursday1:002:35pm
HOMEWORKASSIGNMENT6
DUEThursdayDecember1,2016
Please type your answer following each question and submit your work electronically to
CANVAS by the due date.
Please state clearly how you reach each answer. A numerical
Stat2120,TuesdayandThursday1:002:35pm
HOMEWORKASSIGNMENT4
DUETuesdayNovember1,2016
Please type your answer following each question and submit your work electronically to
CANVAS by the due date.
Please state clearly how you reach each answer. A numerical v
Stat2120,TuesdayandThursday1:002:35pm
HOMEWORKASSIGNMENT2
DUEThursdaySeptember22,2016
Please type your answer following each question and submit your work electronically to
CANVAS by the due date.
1. The data below show the number of minutes that elapsed
Section 7.1 - Part 2 - Class Example Write-up
Example 3
Comment on graphs: The normality assumption appears to be valid based on the histogram, but
not according to the normal probability plot. The robustness guidelines indicate that with a
sample size of
Section 7.1 Example 2
The Anderson-Darling normality test is used to test if a dataset comes from a population with a normal distribution.
The two hypotheses for the Anderson-Darling test for the normal distribution are :
H0: The data follows the normal d
Chapter 14 Paper
11/21/2016
Joseph Bauer
Part A)
1)
The dependent variable is the Current Value and the independent variable is the Revenue.
NBA Scatter Plot
3000
2500
2000
Current Value ($mil)
1500
1000
500
0
100
150
200
250
300
350
Revenue ($mil)
2) The
STAT 2120
Homework #2
1. A)
Histogram of C1
14
12
Frequency
10
8
6
4
2
0
13.5
15.0
16.5
18.0
19.5
21.0
22.5
24.0
C1
The Histogram represents the frequency of the time it takes a patient to take a drug for their migraine
headache. The histogram is skewed l
Homework STAT 2120
Due January 26, 2017
Number 1:
You are numbering the 18 stocks in the New York Stock Exchange from 1 to 18. After that, you
randomly select six numbers out of the 18. You would random sample 6 out of the 18 with this
scheme. So randomly
Stat2120,TuesdayandThursday1:002:15pm
HOMEWORKASSIGNMENT4
DUEThursdayMarch23,2017
Please type your answer following each question and submit your work electronically to
CANVAS by the due date.
1. The following data are the random samples of sales of two c
STAT 2120
Homework # 3
1 ) According to estimates made by the General Accounting Office, the Walmart customer service
answered 18.3 million telephone enquires during a Christmas season, and 17% of the Walmart
customer representatives provided answers that
Stat2120,TuesdayandThursday1:002:35pm
HOMEWORKASSIGNMENT6
DUEThursdayApril20,2017
Please type your answer following each question and submit your work electronically to
CANVAS by the due date.
Please state clearly how you reach each answer. A numerical va
Stat2120,TuesdayandThursday1:002:35pm
HOMEWORKASSIGNMENT5
DUETuesdayApril11,2017
Please type your answer following each question and submit your work electronically to
CANVAS by the due date.
Please state clearly how you reach each answer. A numerical val
5.8)
A) The probability that exactly 3 members of the committee are Hispanic is .17004.
B) The probability that 3 or fewer members are Hispanic is .296868
5.62)
A) The mean number of Hispanics on randomly chosen committees of 15 is 4.51.
B) The standard d
6.16)
In preparation I calculated a sample mean of 28.8 and a sample standard deviation of 6.8934.
A) The standard deviation of x is 1.54141.
B) Based on a .95 confidence level the margin of error is 3.02117.
C) The confidence interval is lower bound of 2
4.108)
A) The standard deviation of the mean is 5.773503
B) The measurement must be repeated 4 times in order for the standard deviation of the mean to
be 5.
4.112)
A) The probability that the mean annual return will be greater than .15 is .54826.
B) The
1)
A) Eleanor has a standardized score SAT score of 1.8 and Gerald has a standardized ACT score
of 1.5 which means that Eleanor has the higher score relative to her data set.
B) 96.41 % of the students scored higher than Eleanor and 93.32% of the students
Stat 2120, Tuesday and Thursday 1:00-2:15 pm
HOMEWORK ASSIGNMENT 4
DUE
Thursday March 23, 2017
Please type your answer following each question and submit your
work electronically to CANVAS by the due date.
1. The following data are the random samples of s