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)
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
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
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
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
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
1.5) There are five variables in question regarding the Apartment rentals for students and the
categorical and quantitative status for each goes as follows; monthly rent is quantitative, whether
or not cable is included free of charge is categorical, whet
4.16)
A) The sampling space is S=cfw_Closed,Open because those are the only two possible outcomes.
B) The sampling space for the duration of waiting time for a rust prevention treatment to stop
working is the amount of treatment applied to the car in what
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
1.46
A)
Stem-and-leaf of Growth
N
= 12
Leaf Unit = 0.10
1
2
9
3
3
29
(4)
4
1467
5
5
24
3
6
2
2
7
2
1
8
1
9
4
B)
The mean growth is 5.1 while the median is 4.65. The mean is brought up to 5.1 due to the
outlier 9.2 dragging the growth rate significantly hi
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
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
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 - 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 >
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
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 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
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
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
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
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