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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

HI! HELP ME PLEASE. THANK YOU SO MUCH!

A scrap metal dealer claims that the mean of
his cash sales is “no more than $80,” but an Inter nal
Revenue Service agent believes the dealer is untruthful.
Observing a sample of 20 cash customers, the agent finds
the mean purchase to be $91, with a standard deviation
of $21. Assuming the population is approximately normally distributed, and using the 0.05 level of significance,
is the agent’s suspicion confirmed?

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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