Answered: In a random sample of six mobile…

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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Part 1

The

99%

confidence interval for the population mean

(43.61

43.61,86.39

86.39).

(Round to two decimal places as needed.)

Part 2

The margin of error is

$21.40

21.40.

(Round to two decimal places as needed.)

Part 3

Interpret the results. Choose the correct answer below.

It can be said that

99%

of mobile devices have a repair cost between the bounds of the confidence interval.

With

99%

confidence, it can be said that the population mean repair cost is between the bounds of the confidence interval.

If a large sample of mobile devices are taken approximately

99%

of them will have repair costs between the bounds of the confidence interval.

With

99%

confidence, it can be said that the repair cost is between the bounds of the confidence interval.

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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