Introduction To Statistics And Data Analysis
6th Edition
ISBN: 9781337793612
Author: PECK, Roxy.
Publisher: Cengage Learning,
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Chapter 6.3, Problem 17E
A large department store offers online ordering. When a purchase is made online, the customer can select one of four different delivery options: expedited overnight delivery, expedited second-day delivery， standard delivery, or delivery to the nearest store for customer pick-up. Consider the chance experiment that consists of observing the selected delivery option for a randomly selected online purchase. What are the four simple
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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 6 Solutions
Introduction To Statistics And Data Analysis
Ch. 6.1 - Define the term chance experiment, and give an...Ch. 6.1 - Define the term sample space, and then give the...Ch. 6.1 - Consider the chance experiment in which the type...Ch. 6.1 - Refer to the chance experiment described in the...Ch. 6.1 - A tennis shop sells five different brands of...Ch. 6.1 - Refer to the chance experiment described in the...Ch. 6.1 - A new model of laptop computer can be ordered with...Ch. 6.1 - A college library has four copies of a certain...Ch. 6.1 - A library has five copies of a certain textbook on...Ch. 6.1 - Suppose that, starting at a certain time,...
Ch. 6.1 - Refer to the previous exercise and now suppose...Ch. 6.1 - A family consisting of three peopleP1, P2, and...Ch. 6.1 - Prob. 13ECh. 6.1 - An engineering construction firm is currently...Ch. 6.1 - For the events described in the previous exercise,...Ch. 6.1 - Consider a Venn diagram picturing two events A and...Ch. 6.3 - A large department store offers online ordering....Ch. 6.3 - Consider the chance experiment described in the...Ch. 6.3 - The manager of an online music store has kept...Ch. 6.3 - Consider the chance experiment described in the...Ch. 6.3 - A bookstore sells two types of books (fiction and...Ch. 6.3 - Consider the chance experiment described in the...Ch. 6.3 - Medical insurance statuscovered (C) or not covered...Ch. 6.3 - Roulette is a game of chance that involves...Ch. 6.3 - Phoenix is a hub for a large airline. Suppose that...Ch. 6.3 - A customer satisfaction survey is planned. The...Ch. 6.3 - A professor assigns five problems to be completed...Ch. 6.3 - Refer to the following information on full-term...Ch. 6.3 - The report Teens, Social Media Technology...Ch. 6.3 - According to The Chronicle for Higher Education...Ch. 6.3 - The same issue of The Chronicle for Higher...Ch. 6.3 - A deck of 52 playing cards is mixed well, and 5...Ch. 6.3 - After all students have left the classroom, a...Ch. 6.3 - Use the information given in the previous exercise...Ch. 6.3 - The student council for a school of science and...Ch. 6.3 - A student placement center has requests from five...Ch. 6.3 - Suppose that a six-sided die is weighted so that...Ch. 6.4 - Two different airlines have a flight from Los...Ch. 6.4 - The article Chances Are You Know Someone with a...Ch. 6.4 - The accompanying data are from the article...Ch. 6.4 - Using the probabilities calculated in the previous...Ch. 6.4 - The following graphical display is similar to one...Ch. 6.4 - The article Americans Growing More Concerned About...Ch. 6.4 - The events E and T are defined as E = the event...Ch. 6.4 - The newspaper article Folic Acid Might Reduce Risk...Ch. 6.4 - Suppose that an individual is randomly selected...Ch. 6.4 - Is ultrasound a reliable method for determining...Ch. 6.4 - The paper Accuracy and Reliability of...Ch. 6.4 - The report 2015 Utah Seat Belt Use Survey (Utah...Ch. 6.4 - The National Highway Traffic Safety Administration...Ch. 6.4 - Use the information given in the previous exercise...Ch. 6.4 - The paper Good for Women, Good for Men, Bad for...Ch. 6.5 - Many fire stations handle emergency calls for...Ch. 6.5 - Refer to the information given in the previous...Ch. 6.5 - The paper Predictors of Complementary Therapy Use...Ch. 6.5 - The report TV Drama/Comedy Viewers and Health...Ch. 6.5 - The report Great Jobs, Great Lives. The...Ch. 6.5 - In a small city, approximately 15% of those...Ch. 6.5 - Jeanie is a bit forgetful, and if she doesnt make...Ch. 6.5 - Consider a system consisting of four components,...Ch. 6.5 - Consider the system described in the previous...Ch. 6.5 - In a January 2016 Harris Poll, each of 2252...Ch. 6.5 - Consider the following events: T = event that a...Ch. 6.5 - The following case study was reported in the...Ch. 6.5 - Three friends (A, B, and C) will participate in a...Ch. 6.5 - A store sells two different brands of dishwasher...Ch. 6.5 - The National Public Radio show Car Talk used to...Ch. 6.5 - Refer to the previous exercise. Suppose now that...Ch. 6.6 - A university has 10 vehicles available for use by...Ch. 6.6 - Prob. 70ECh. 6.6 - There are two traffic lights on Darlenes route...Ch. 6.6 - Let F denote the event that a randomly selected...Ch. 6.6 - According to a July 31, 2013 posting on cnn.com, a...Ch. 6.6 - Suppose that Blue Cab operates 15% of the taxis in...Ch. 6.6 - A large cable company reports the following: 80%...Ch. 6.6 - Refer to the information given in the previous...Ch. 6.6 - The authors of the paper Do Physicians Know When...Ch. 6.6 - A study of how people are using online services...Ch. 6.6 - The report Twitter in Higher Education: Usage...Ch. 6.6 - Use the information given in the previous exercise...Ch. 6.6 - Prob. 81ECh. 6.6 - Use the table of estimated probabilities from the...Ch. 6.6 - Suppose that we define the following events: C =...Ch. 6.6 - The article U.S. Investors Split Between Digital...Ch. 6.6 - Prob. 85ECh. 6.6 - The paper referenced in the previous exercise also...Ch. 6.6 - In an article that appears on the web site of the...Ch. 6.7 - The report Airline Quality Rating 2016...Ch. 6.7 - Five hundred first-year students at a state...Ch. 6.7 - Use the information given in the previous exercise...Ch. 6.7 - The table given below describes (approximately)...Ch. 6.7 - On April 1, 2010, the Bureau of the Census in the...Ch. 6.7 - Refer to the information given in the previous...Ch. 6.7 - Refer to the information given in Exercises 6.92...Ch. 6 - False positive results are not uncommon with...Ch. 6 - A company uses three different assembly linesA1,...Ch. 6 - Consider the following information about...Ch. 6 - Use the information given in the previous exercise...Ch. 6 - Use the information given in exercise 6.102 to...Ch. 6 - Prob. 105CRCh. 6 - The following table summarizing data on smoking...Ch. 6 - A study of the impact of seeking a second opinion...Ch. 6 - A company sends 40% of its overnight mail parcels...Ch. 6 - Prob. 109CRCh. 6 - Prob. 110CRCh. 6 - In a school machine shop, 60% of all machine...Ch. 6 - There are five faculty members in a certain...Ch. 6 - The general addition rule for three events states...Ch. 6 - A theater complex is currently showing four...Ch. 6 - Prob. 117CRCh. 6 - Suppose that a box contains 25 light bulbs, of...Ch. 6 - Return to Exercise 6.118, and suppose that 4 bulbs...Ch. 6 - A transmitter is sending a message using a binary...
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