Introduction to Probability and Statistics
14th Edition
ISBN: 9781133103752
Author: Mendenhall, William
Publisher: Cengage Learning
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Chapter 11.10, Problem 11.47E
To determine
To Find: A
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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 11 Solutions
Introduction to Probability and Statistics
Ch. 11.5 - Prob. 11.1ECh. 11.5 - Prob. 11.2ECh. 11.5 - Prob. 11.3ECh. 11.5 - Prob. 11.4ECh. 11.5 - Prob. 11.5ECh. 11.5 - Prob. 11.6ECh. 11.5 - These data are observations collected using a...Ch. 11.5 - Prob. 11.8ECh. 11.5 - Prob. 11.9ECh. 11.5 - Reducing Hostility A clinical psychologist wished...
Ch. 11.5 - Prob. 11.11ECh. 11.5 - Assembling Electronic Equipment An experiment was...Ch. 11.5 - Prob. 11.13ECh. 11.5 - Prob. 11.14ECh. 11.5 - Prob. 11.16ECh. 11.5 - The Cost of Lumber A national home builder wants...Ch. 11.6 - Prob. 11.19ECh. 11.6 - Prob. 11.20ECh. 11.6 - Prob. 11.21ECh. 11.6 - Prob. 11.22ECh. 11.6 - Prob. 11.23ECh. 11.6 - Prob. 11.26ECh. 11.8 - Prob. 11.28ECh. 11.8 - Prob. 11.29ECh. 11.8 - Do the data of Exercise 11.28 provide sufficient...Ch. 11.8 - Prob. 11.31ECh. 11.8 - Prob. 11.32ECh. 11.8 - Prob. 11.34ECh. 11.8 - The partially completed ANOVA table for a...Ch. 11.8 - Gas Mileage A study was conducted to compare...Ch. 11.8 - Prob. 11.38ECh. 11.8 - Prob. 11.39ECh. 11.8 - Digitalis and Calcium Uptake A study was conducted...Ch. 11.8 - Bidding on Construction Jobs A building contractor...Ch. 11.8 - Premium Equity? The cost of auto insurance varies...Ch. 11.8 - Prob. 11.43ECh. 11.8 - Prob. 11.44ECh. 11.10 - Prob. 11.45ECh. 11.10 - Prob. 11.46ECh. 11.10 - Prob. 11.47ECh. 11.10 - Prob. 11.48ECh. 11.10 - Prob. 11.49ECh. 11.10 - Demand for Diamonds A chain of jewelry stores...Ch. 11.10 - Terrain Visualization A study was conducted to...Ch. 11.10 - Prob. 11.52ECh. 11.10 - Prob. 11.53ECh. 11.10 - Prob. 11.54ECh. 11.10 - Prob. 11.55ECh. 11 - Prob. 11.56SECh. 11 - Prob. 11.57SECh. 11 - Prob. 11.58SECh. 11 - Prob. 11.59SECh. 11 - Prob. 11.60SECh. 11 - Prob. 11.61SECh. 11 - Prob. 11.62SECh. 11 - Prob. 11.63SECh. 11 - Prob. 11.64SECh. 11 - Prob. 11.65SECh. 11 - Prob. 11.66SECh. 11 - Prob. 11.67SECh. 11 - Yield of Wheat The yields of wheat(in bushels per...Ch. 11 - Prob. 11.69SECh. 11 - Professor’s Salaries In a study of starting...Ch. 11 - Prob. 11.71SECh. 11 - Prob. 11.72SECh. 11 - Prob. 11.73SECh. 11 - Prob. 11.74SE
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