Answered: Dr. Loras Tyrell was curious to see if…

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

Dr. Loras Tyrell was curious to see if his students actually saved money by purchasing books from sources other than the college bookstore. He administered a survey to all his students asking how they obtained their book (Bookstore, Rented, ebook, or on the web – WebBooks) and how much they paid for the book. He obtained the information below.

If the values are normally distributed, we know that of the students who purchased the eBook, about 95.4% of those students paid approximately $----- to ----?

Statistics
Bookstore Rented
eBook
WebBooks
Valid
8
8
8
Missing
Мean
Median
Mode
Std. Deviation
Variance
Range
70.5000
70.5000
42.00a
30.46778
928.286
57.00
51.1250
52.5000
45.00
14.63301
214.125
46.00
21.1250
22.0000
11.00a
4.99821
24.982
16.00
12.7500
9.5000
9.00
10.99026
|120.786
31.00

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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