EBK STATISTICAL TECHNIQUES IN BUSINESS
17th Edition
ISBN: 9781259924163
Author: Lind
Publisher: MCGRAW HILL BOOK COMPANY
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Textbook Question
Chapter 19, Problem 14E
Dave Christi runs a car wash chain with outlets scattered throughout Chicago. He is concerned that some local managers are giving away free washes to their friends. He decides to collect data on the number of “voided” sales receipts. Of course, some of them are legitimate voids. Would the following data indicate a reasonable number of voids at his facilities: 3, 8, 3, 4, 6, 5, 0, 1, 2, 4? Construct a control chart for this process and comment on whether the process is “in control.”
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Would you like a cup of tea?
Carole and Julius are getting ready to open a new cafe and are gathering up information about sales of different drinks in their state. They obtain data containing the yearly sales (in $1000s) for
three types of tea: Darjeeling, Earl Grey, and Green Tea. A boxplot of the data and a histogram of the sales for all three teas combined is shown below.
Note: Clicking on any image in this problem will open it in a new window, allowing you to enlarge the view.
Tea Sales by Product
Combined Tea Sales
Darjeeling
Earl Grey
Green Tea
100
200
300
400
Product
Sales in $1000
Part 1: Use the plots above to make quantitative comparisons and answer the following questions:
Quantity A: The 75th percentile (Q3) of Sales for Darjeeling Tea
Quantity B: The 75th percentile (Q3) of Sales for Green Tea
Quantity A is greater
Quantity A: The median of Sales for Darjeeling Tea
Quantity B: The median of Sales for Green Tea
Quantity B is greater
00€
007
Frequency
>
000
008
007
Sales in…
Would you like a cup of tea?
Carole and Julius are getting ready to open a new cafe and are gathering up information about sales of different drinks in their state. They obtain data containing the yearly sales (in $1000s) for
three types of tea: Darjeeling, Earl Grey, and Green Tea. A boxplot of the data and a histogram of the sales for all three teas combined is shown below.
Note: Clicking on any image in this problem will open it in a new window, allowing you to enlarge the view.
Tea Sales by Product
Combined Tea Sales
Darjeeling
Earl Grey
Green Tea
100
200
300
400
Product
Sales in $1000
Part 1: Use the plots above to make quantitative comparisons and answer the following questions:
Quantity A: The 75th percentile (Q3) of Sales for Darjeeling Tea
Quantity B: The 75th percentile (Q3) of Sales for Green Tea
Quantity A is greater
008
007
Frequency
00z
001
Sales in $1000
The table to the right shows the arrival
data for two airlines in five cities.
Complete parts (a) through (c) below.
Excelsior Airlines
Percentage Number of
on-time arrivals
Destination
Los Angeles
94.5%
Phoenix
95.7%
San Diego
94.4%
San Francisco 83.5%
85.9%
Seattle
Total
440
277
101
631
2183
3632
Paradise Airlines
Percentage Number of
on-time
arrivals
87.9%
94.6%
88.6%
75.6%
72.8%
821
5177
406
405
259
7068
a. Which airline has the higher percentage of on-time flights to the five cities?
Excelsior Airlines has the higher percentage of on-time flights.
b. Compute the percentage of on-time flights for the two airlines over all five cities.
Over all five cities, Excelsior Airlines had an on-time percentage of % and Paradise Airlines had an on-time
percentage of %.
(Round to the nearest tenth as needed.)
Chapter 19 Solutions
EBK STATISTICAL TECHNIQUES IN BUSINESS
Ch. 19 - The Rouse Home, located on the south side of...Ch. 19 - Tom Sharkey is the owner of Sharkey Chevy, Buick,...Ch. 19 - Out of 110 diesel engines tested, a rework and...Ch. 19 - The manager of River City McDonalds randomly...Ch. 19 - Describe the difference between assignable...Ch. 19 - Describe the difference between an attribute...Ch. 19 - Samples of size n = 4 are selected from a...Ch. 19 - Samples of size 5 are selected from a...Ch. 19 - A new industrial oven has just been installed at...Ch. 19 - Refer to Exercise 7. a. On the basis of this...
Ch. 19 - Auto-Lite Company manufactures car batteries. At...Ch. 19 - Below is a p-chart for a manufacturing process. a....Ch. 19 - Inter-State Moving and Storage Company is setting...Ch. 19 - A bicycle manufacturer randomly selects 10 frames...Ch. 19 - During the process of producing toilet paper,...Ch. 19 - Sams Supermarkets monitors the checkout scanners...Ch. 19 - Dave Christi runs a car wash chain with outlets...Ch. 19 - Compute the probability of accepting a lot of DVDs...Ch. 19 - Determine the probability of accepting lots that...Ch. 19 - Determine the probability of accepting lots that...Ch. 19 - Warren Electric manufactures fuses for many...Ch. 19 - Grills Video Products purchases LCDs from Mira...Ch. 19 - The production supervisor at Westburg Electric...Ch. 19 - The manufacturer of running shoes conducted a...Ch. 19 - At Rumseys Old Fashion Roast Beef, cola drinks are...Ch. 19 - A new machine has just been installed to produce...Ch. 19 - Long Last Tire Company, as part of its inspection...Ch. 19 - Charter National Bank has a staff of loan officers...Ch. 19 - Prob. 25CECh. 19 - Early Morning Delivery Service guarantees delivery...Ch. 19 - An automatic machine produces 5.0-millimeter bolts...Ch. 19 - Steele Breakfast Foods Inc. produces a popular...Ch. 19 - An investor believes there is a 5050 chance that a...Ch. 19 - Lahey Motors specializes in selling cars to buyers...Ch. 19 - A process engineer is considering two sampling...Ch. 19 - Christina Sanders is a member of the womens...Ch. 19 - Erics Cookie House sells chocolate chip cookies in...Ch. 19 - The numbers of near misses recorded for the last...Ch. 19 - Prob. 35CECh. 19 - Swiss Watches, Ltd. purchases watch stems for...Ch. 19 - Automatic Screen Door Manufacturing Company...Ch. 19 - Prob. 38CE
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- You're a data analyst for an insurance company. You want to make sure that your employer is not over-paying for car repairs. To investigate this, you bring 38 different cars to two different garages, Bubba's Hubcap Heaven and Repair, and Merle's Motor Shop. Some of the cars need lots of repairs. Some of the cars need very few. By taking each car to both shops, we can directly compare the two sets of prices. The dataset is in an Excel file named "Bubba_v_Merle_3899.xls", which you can find in the "Data" folder under Course Documents. Before running your analysis, be sure to look at the data file and verify that each car requires a different amount of repairs, and that prices in one shop are correlated with prices at the other shop. That is, they're in the same ballpark. The question is whether one tends to charge more, on average, than the other. Your task is to use Excel to test the research hypothesis that prices are different in the two shops; the null hypothesis is that prices are…arrow_forwardYou're a data analyst for an insurance company. You want to make sure that your employer is not over-paying for car repairs. To investigate this, you bring 42 different cars to two different garages, Bubba's Hubcap Heaven and Repair, and Merle's Motor Shop. Some of the cars need lots of repairs. Some of the cars need very few. By taking each car to both shops, we can directly compare the two sets of prices. The dataset is in an Excel file named "Bubba_v_Merle_4299.xls", which you can find in the "Data" folder under Course Documents. Before running your analysis, be sure to look at the data file and verify that each car requires a different amount of repairs, and that prices in one shop are correlated with prices at the other shop. That is, they're in the same ballpark. The question is whether one tends to charge more, on average, than the other. Your task is to use Excel to test the research hypothesis that prices are different in the two shops; the null hypothesis is that prices are…arrow_forward
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