Answered: The state test scores for 12 randomly…

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 state test scores for 12 randomly selected high school seniors are shown on the right. Complete parts (a) through (c) below.

1442	1224	983
690	721	838
730	741	540
624	1442	946

Assume the population is normally distributed.

(a) Find the sample mean.

(b) Find the sample standard deviation.

A 90% confidence interval for the population mean is ....

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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