The employee's mistake would have the following effect: The median would stay the sameincrease    decrease The mean would decreaseincrease    stay the same The mode would increasestay the same    decrease The IQR would increasedecrease    stay the same The standard deviation would decreaseincrease    stay the same

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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he Environmental Protection Agency (EPA) uses a measure called the Pollutant Standards Index (PSI) to measure air quality in a city. A PSI reading over 100 indicates a day when the air quality is considered unhealthy. The measurements represent the number of days in 1995 that the PSI was over 100 for twenty metropolitan areas in the U.S. Midwest.

0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 3, 4, 4, 4, 4, 5, 7, 7, 11, 14

A careless employee originally recorded a number that was at least 20 times larger than 14:

0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 3, 4, 4, 4, 4, 5, 7, 7, 11, (much larger than 14)

The employee's mistake would have the following effect:

The median would

stay the sameincrease    decrease


The mean would

decreaseincrease    stay the same


The mode would

increasestay the same    decrease


The IQR would

increasedecrease    stay the same


The standard deviation would

decreaseincrease    stay the same
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