Probability and Statistics for Engineers and Scientists
9th Edition
ISBN: 9780321629111
Author: Ronald E. Walpole, Raymond H. Myers, Sharon L. Myers, Keying Ye
Publisher: Prentice Hall
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Chapter 5.3, Problem 41E
To determine
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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 5 Solutions
Probability and Statistics for Engineers and Scientists
Ch. 5.2 - Prob. 1ECh. 5.2 - Twelve people are given two identical speakers,...Ch. 5.2 - An employee is selected from a staff of 10 to...Ch. 5.2 - In a certain city district, the need for money to...Ch. 5.2 - According to Chemical Engineering Progress...Ch. 5.2 - Prob. 6ECh. 5.2 - Prob. 7ECh. 5.2 - Prob. 8ECh. 5.2 - Prob. 9ECh. 5.2 - Prob. 10E
Ch. 5.2 - The probability that a patient recovers from a...Ch. 5.2 - A traffic control engineer reports that 75% of the...Ch. 5.2 - A national study that examined attitudes about...Ch. 5.2 - The percentage of wins for the Chicago Bulls...Ch. 5.2 - Prob. 15ECh. 5.2 - Prob. 16ECh. 5.2 - If X represents the number of people in Exercise...Ch. 5.2 - Prob. 18ECh. 5.2 - According to USA Today (March 18, 1997), of 4...Ch. 5.2 - Prob. 21ECh. 5.2 - Prob. 22ECh. 5.2 - Prob. 23ECh. 5.2 - Prob. 24ECh. 5.2 - Prob. 25ECh. 5.2 - Assuming that 6 in 10 automobile accidents are due...Ch. 5.2 - Prob. 27ECh. 5.2 - Prob. 28ECh. 5.3 - A homeowner plants 6 bulbs selected at random from...Ch. 5.3 - To avoid detection at customs, a traveler places 6...Ch. 5.3 - A random committee of size 3 is selected from 4...Ch. 5.3 - From a lot of 10 missiles, 4 are selected at...Ch. 5.3 - If 7 cards are dealt from an ordinary deck of 52...Ch. 5.3 - Prob. 34ECh. 5.3 - A company is interested in evaluating its current...Ch. 5.3 - A manufacturing company uses an acceptance scheme...Ch. 5.3 - Prob. 37ECh. 5.3 - Prob. 38ECh. 5.3 - Prob. 39ECh. 5.3 - Prob. 40ECh. 5.3 - Prob. 41ECh. 5.3 - Prob. 42ECh. 5.3 - Prob. 43ECh. 5.3 - Prob. 44ECh. 5.3 - Prob. 45ECh. 5.3 - Prob. 46ECh. 5.3 - Prob. 47ECh. 5.3 - Prob. 48ECh. 5.5 - Prob. 49ECh. 5.5 - Prob. 50ECh. 5.5 - Prob. 51ECh. 5.5 - Prob. 52ECh. 5.5 - Prob. 53ECh. 5.5 - Prob. 54ECh. 5.5 - Prob. 55ECh. 5.5 - Prob. 56ECh. 5.5 - Prob. 57ECh. 5.5 - Prob. 58ECh. 5.5 - Prob. 59ECh. 5.5 - Prob. 60ECh. 5.5 - Prob. 61ECh. 5.5 - Prob. 62ECh. 5.5 - Prob. 63ECh. 5.5 - Prob. 64ECh. 5.5 - Prob. 65ECh. 5.5 - Prob. 66ECh. 5.5 - Prob. 67ECh. 5.5 - Prob. 68ECh. 5.5 - Prob. 69ECh. 5.5 - Prob. 70ECh. 5.5 - Prob. 71ECh. 5.5 - Prob. 72ECh. 5.5 - Prob. 73ECh. 5.5 - Prob. 74ECh. 5.5 - Prob. 75ECh. 5.5 - Prob. 76ECh. 5.5 - Prob. 77RECh. 5.5 - Prob. 78RECh. 5.5 - Prob. 79RECh. 5.5 - Prob. 80RECh. 5.5 - Prob. 81RECh. 5.5 - Prob. 82RECh. 5.5 - Prob. 83RECh. 5.5 - Prob. 84RECh. 5.5 - Prob. 85RECh. 5.5 - Prob. 86RECh. 5.5 - Prob. 87RECh. 5.5 - Prob. 88RECh. 5.5 - Prob. 89RECh. 5.5 - Prob. 90RECh. 5.5 - Prob. 91RECh. 5.5 - Prob. 92RECh. 5.5 - Prob. 93RECh. 5.5 - Prob. 94RECh. 5.5 - Prob. 95RECh. 5.5 - Prob. 96RECh. 5.5 - Prob. 97RECh. 5.5 - Prob. 98RECh. 5.5 - Prob. 99RECh. 5.5 - Prob. 100RECh. 5.5 - Prob. 101RE
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