Answered: The grade point averages (GPA) for 12…

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

The grade point averages (GPA) for

randomly selected college students are shown on the right. Complete parts (a) through (c) below.

Assume the population is normally distributed.

2.4	3.4	2.7
1.8	0.9	4.0
2.2	1.1	3.6
0.4	2.1	3.1

(a) Find the sample mean.

x=_____

(Round to two decimal places as needed.)

(b) Find the sample standard deviation.

s=_____

(Round to two decimal places as needed.)

90%

confidence interval for the population mean

μ.

90%

confidence interval for the population mean is (__, __)

(Round to two decimal places as needed.)

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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