Learning Materials
Features
Discover
Chapter 2: Q91. (page 116)
Give the percentage of measurements in a data set that are above and below each of the following percentiles:
a. 75th percentile
b. 50th percentile
c. 20th percentile
d. 84th percentile
Over 30 million students worldwide already upgrade their learning with 91影视!
All the tools & learning materials you need for study success - in one app.
Get started for free
Using only integers between 0 and 10, construct two data sets with at least 10 observations each so that the two sets have the same mean but different variances. Construct dot plots for each of your data sets and mark the mean of each data set on its dot diagram.
Question: State SAT scores.Refer to Exercise 2.27 (p. 84) and the data on state SAT scores. Construct a scatterplot for the data, with the 2010 Math SAT score on the horizontal axis and the 2014 Math SAT score on the vertical axis. What type of trend do you detect?
State | 2010 Math SAT | 2014 Math SAT |
Alabama | 538 | 550 |
Alaska | 503 | 513 |
Arizona | 527 | 524 |
Arkansa | 571 | 564 |
California | 510 | 516 |
Wisconsin | 608 | 603 |
Wyoming | 599 | 565 |
Land purchase decision.A buyer for a lumber company must decide whether to buy a piece of land containing 5,000 pine trees. If 1,000 of the trees are at least 40 feet tall, the buyer will purchase the land; otherwise, he won鈥檛. The owner of the land reports that the height of the trees has a mean of 30 feet and a standard deviation of 3 feet. Based on this information, what is the buyer鈥檚 decision?
Question: Corporate sustainability of CPA firms.Refer to the Business and Society(March 2011) study on the sustainability
behaviors of CPA corporations, Exercise 2.48 (p. 96). Numerical measures of variation for level of support for the 992 senior managers are shown in the accompanying Minitab printout.
Descriptive Statistics: Support | |||||||
Variable | N | Mean | StDev. | Variance | Minimum | Maximum | Range |
Support | 992 | 67.755 | 26.871 | 722.036 | 0.000 | 155.000 | 155.000 |
a.Locate the range on the printout. Comment on the accuracy of the statement: 鈥淭he difference between the largest and smallest values of level of support for the 992 senior managers is 155 points.鈥�
b.Locate the variance on the printout. Comment on the accuracy of the statement: 鈥淥n average, the level of support for corporate sustainability for the 992 senior managers is 722 points.鈥�
c.Locate the standard deviation on the printout. Does the distribution of support levels for the 992 senior managers have more or less variation than another distribution with a standard deviation of 50? Explain.
d.Which measure of variation best describes the distribution of 992 support levels? Explain.
Performance-based logistics.Refer to the Journal of Business Logistics(Vol. 36, 2015) study of the factors thatlead to successful performance-based logistics (PBL) projects, Exercise 1.15 (p. 49). Recall that the opinions of a sampleof 17 Department of Defense employees and suppliers weresolicited during interviews. Demographics (current position,organization type, experience) were recorded for each intervieweeand the data are listed in the table below.
a.Find and interpret the mean years of experience for the 17 interviewees.
b.Find and interpret the median years of experience for the 17 interviewees.
c.Find and interpret the mode of the 17 years of experience values.
Interviewee | Position | Organization | Experience(years) |
1 | Vice president | Commercial | 30 |
2 | Postproduction | Government | 15 |
3 | Analyst | Commercial | 10 |
4 | Senior manager (mgr.) | Government | 30 |
5 | Support chief | Government | 30 |
6 | Specialist | Government | 25 |
7 | Senior analyst | Commercial | 9 |
8 | Division chief | Government | 6 |
9 | Item mgr. | Government | 3 |
10 | Senior mgr. | Government | 20 |
11 | MRO mgr. | Government | 25 |
12 | Logistics mgr. | Government | 30 |
13 | MRO mgr. | Commercial | 10 |
14 | MRO mgr. | Commercial | 5 |
15 | MRO mgr. | Commercial | 10 |
16 | Specialist | Government | 20 |
17 | Chief | Government | 25 |
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine