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Description: A random sample of 95 automobiles traveling on an interstate showed an average speed of 60 mph and a sample standard deviation of 13.8 mph. Assume the distribution of speeds of all the cars is normal with standard deviation 14. If we are interested i

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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A random sample of 95 automobiles traveling on an interstate showed an average speed of 60 mph and a sample standard deviation of 13.8 mph. Assume the distribution of speeds of all the cars is normal with standard deviation 14.

If we are interested in determining an interval estimate for μ at the 80.98% confidence level, the appropriate value to use for z is

A) 1.41

B) 1.61

C) 1.31

D) 1.21

E) 1.51

The 80.98% confidence interval for μ is (note that σ is known)

A) 57.975 to 62.025

B) 57.831 to 62.169

C) 57.687 to 62.313

D) 58.118 to 61.882

If the confidence level is increased to 88%, the length of the confidence interval would

A) stay the same

B) cannot be determined

C) decrease

D) increase

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