Answered: ABILITY Multiple Choice! No long…

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

STATISTICS AND PROBABILITY

Multiple Choice! No long explaantion needed. THUMBS-UP will be given!

A Philippine labor group wishes to know if the mean income of managers in the retail industry is still at 40,000 pesos per month. Based from previous data, the income of managers in the retail industry is normally distributed with a standard deviation of 5,000 pesos per month. A random sample of 23 managers reveals a sample mean of 42,400 pesos.

D. Can the labor group claim that the mean income of managers in the retail industry is still at 40,000 pesos per month?

a.Yes, since 40000 is not inside the computed confidence interval estimate.

b.Yes, since 40000 is inside the computed confidence interval estimate.

c.No, since 40000 is not inside the computed confidence interval estimate.

d. No, since 40000 is inside the computed confidence interval estimate.

E. How large a sample is needed if we want to be 98% confident that our estimate of the true mean life span of the batteries is not off by more than 2,000 pesos?

a.40

b.42

c.25

d.34

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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