Statistics, Binder Ready Version: Unlocking the Power of Data
1st Edition
ISBN: 9781118583104
Author: Robin H. Lock, Patti Frazer Lock, Kari Lock Morgan, Eric F. Lock, Dennis F. Lock
Publisher: WILEY
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Chapter A, Problem 1E
a.
To determine
Check whether the study appears to use random sampling.
a.
Expert Solution
Answer to Problem 1E
Yes, the study appears to use random sampling.
Explanation of Solution
Random Sampling:
Random sampling is a sampling technique where each unit of the population has an equal chance of being selected.
In the given situation, a sample of voters can be asked to which party they voted. Therefore, the study appears to use random sampling.
b.
To determine
Check whether the study appears to use random assignment.
b.
Expert Solution
Answer to Problem 1E
No, the study does not appear to use random assignment.
Explanation of Solution
Random assignment:
Random assignment is a technique where each group has an equal chance of getting each of the population units.
For the given situation in Part (a), there is no situation where voters can be assigned into groups. Therefore, the study does not appear to use random assignment.
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Calculate the 90% confidence interval for the population mean difference using the data in the attached image. I need to see where I went wrong.
Microsoft Excel snapshot for random sampling: Also note the formula used for the last
column
02
x✓ fx =INDEX(5852:58551, RANK(C2, $C$2:$C$51))
A
B
1
No.
States
2
1
ALABAMA
Rand No.
0.925957526
3
2
ALASKA
0.372999976
4
3
ARIZONA
0.941323044
5
4 ARKANSAS
0.071266381
Random Sample
CALIFORNIA
NORTH CAROLINA
ARKANSAS
WASHINGTON
G7
Microsoft Excel snapshot for systematic sampling:
xfx INDEX(SD52:50551, F7)
A
B
E
F
G
1
No.
States
Rand No. Random Sample
population
50
2
1 ALABAMA
0.5296685 NEW HAMPSHIRE
sample
10
3
2 ALASKA
0.4493186 OKLAHOMA
k
5
4
3 ARIZONA
0.707914 KANSAS
5
4 ARKANSAS 0.4831379 NORTH DAKOTA
6
5 CALIFORNIA 0.7277162 INDIANA
Random Sample
Sample Name
7
6 COLORADO 0.5865002 MISSISSIPPI
8
7:ONNECTICU 0.7640596 ILLINOIS
9
8 DELAWARE 0.5783029 MISSOURI
525
10
15
INDIANA
MARYLAND
COLORADO
Suppose the Internal Revenue Service reported that the mean tax refund for the year 2022 was $3401. Assume the standard deviation is $82.5 and that the amounts refunded follow a normal probability distribution. Solve the following three parts? (For the answer to question 14, 15, and 16, start with making a bell curve. Identify on the bell curve where is mean, X, and area(s) to be determined.
1.What percent of the refunds are more than $3,500?
2. What percent of the refunds are more than $3500 but less than $3579?
3. What percent of the refunds are more than $3325 but less than $3579?
Chapter A Solutions
Statistics, Binder Ready Version: Unlocking the Power of Data
Ch. A - Prob. 1ECh. A - Prob. 2ECh. A - Prob. 3ECh. A - Prob. 4ECh. A - Prob. 5ECh. A - Prob. 6ECh. A - Prob. 7ECh. A - Prob. 8ECh. A - Prob. 9ECh. A - Prob. 10E
Ch. A - Prob. 11ECh. A - WHICH GRAPH AND STATISTIC?
For the each of the...Ch. A - Prob. 13ECh. A - Prob. 14ECh. A - Prob. 15ECh. A - Prob. 16ECh. A - Prob. 17ECh. A - Penguin Tags May Do Harm In Data 1.3 on page 10,...Ch. A - Prob. 19ECh. A - Prob. 20ECh. A - Prob. 21ECh. A - Prob. 22ECh. A - Prob. 23ECh. A - Prob. 24ECh. A - Student Survey: Sample or Population? The results...Ch. A - Intensive Care Unit Admissions Data 2.3 on page 69...Ch. A - Prob. 27RECh. A - Prob. 28RECh. A - Prob. 29RECh. A - Prob. 30RECh. A - Prob. 31RECh. A - Prob. 32RECh. A - Prob. 33RECh. A - Prob. 34RECh. A - Prob. 35RECh. A - Prob. 36RECh. A - Prob. 37RECh. A - Prob. 38RECh. A - Prob. 39RECh. A - Prob. 40RECh. A - Prob. 41RECh. A - Percent of College Graduates by Region of the US...Ch. A - Prob. 43RECh. A - Prob. 44RECh. A - Prob. 45RECh. A - Prob. 46RECh. A - Prob. 47RECh. A - Prob. 48RECh. A - Prob. 49RECh. A - Prob. 50RECh. A - Prob. 51RECh. A - Prob. 52RECh. A - Prob. 53RECh. A - Prob. 54RECh. A - Prob. 55RECh. A - Prob. 56RECh. A - Prob. 57RECh. A - Prob. 58RECh. A - Prob. 59RECh. A - Prob. 60RECh. A - Prob. 61RECh. A - Prob. 62RECh. A - Prob. 63RECh. A - Prob. 64RECh. A - Prob. 65RECh. A - Prob. 66RECh. A - Prob. 67RECh. A - Prob. 68RECh. A - Prob. 69RECh. A - Prob. 70RECh. A - Prob. 71RECh. A - Prob. 72RECh. A - Prob. 73RECh. A - Prob. 74RECh. A - Prob. 75RECh. A - Prob. 76RECh. A - Prob. 77RECh. A - Prob. 78RECh. A - Prob. 79RECh. A - Prob. 80RECh. A - Prob. 81RECh. A - Prob. 82RECh. A - Prob. 83RECh. A - Prob. 84RECh. A - Prob. 85RECh. A - Prob. 86RECh. A - Prob. 87RECh. A - Prob. 88RECh. A - Prob. 89RECh. A - Prob. 90RECh. A - Prob. 91RECh. A - Prob. 92RECh. A - Prob. 93RECh. A - Prob. 94RECh. A - Prob. 95RECh. A - Prob. 96RECh. A - Prob. 97RECh. A - Predicting Percent of College Graduates Using High...Ch. A - Predicting Percent of College Graduates Using...Ch. A - Investigating NBA Statistics The dataset...Ch. A - Investigating the Happy Planet Index In Exercise...
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