Answered: An e-business manager wants to use the…

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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An e-business manager wants to use the Normal zz distribution to estimate the average browsing time of potential cutomers, visiting a certain website. The value of the standard deviation of all browsing times is known. To construct a 95% confidence interval the e-business manager originally selected a random sample of 50 browsing times, and then increased the sample size to 80. Choose the correct statement.

The confidence interval became longer.
The confidence interval didn't change.
The confidence interval became shorter.
There is no relation between the length of the confidence interval and the sample size.
None of the above.

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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