Answered: calculate a 99% confidence interval for…

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

A computer information systems manager is debating which of two similarly priced laptop battery packs to purchase. He is interested in determining whether there is a difference in the average time the battery packs function before needing to be recharged.

Based on two independent random samples, the following summary information was computed:

Model 1

Sample size 15

Sample mean 6.2 hours

Sample standard deviation 2.6 hours

Model 2

Sample size 16 S

Sample mean 6.5 hours

Sample standard deviation 2.6 hours

Assuming normal populations with equal variances, calculate a 99% confidence interval for the difference in the average functioning time of the two models.

10 engineering schools were surveyed. The first random sample of 250 electrical engineers had 80 women, and the second random sample of 175 chemical engineers had 40 women. Obtain an 80% confidence interval for the difference in proportions of women in these two engineering fields.

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