Answered: A car dealer randomly selects 24…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

A car dealer randomly selects 24 automatic cars and 21 manual cars to compare the fuel efficiency of the engines. A dotplot of the data is shown below, where each dot represents the fuel efficiency of one car (km/l) in the sample (greater fuel efficiency is indicated by larger numbers).

Choose TWO options that best describes what the graph tell you about the fuel efficiency of the cars in the sample:

a) fuel efficiency for manual cars is positively skewed.

b) manual cars have the higher median fuel efficiency.

c) the least fuel efficient car in the sample is manual.

d) the most fuel efficient car in the sample is automatic.

e) automatic have the larger range.

d) fuel efficiency for manual cars is negatively skewed.

Manual
Automatic
4
:..….…..
CO
6
8
10
Fuel Efficiency (km/l)
12
* ***** *****
14

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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