A recent survey showed that from a sample of 500 packages delivered by a Postal Service, 480 were delivered on time.Construct a 95% confidence interval for the proportion of all packages that are delivered on time by the Postal Service.The manager of the Postal Services claims that 98 percent of their mail are delivered on time. Test at the 1% significance level to determine whether the true proportion is less than 98 percent.

From the provided information, Sample size (n) = 500 Out of which 480 were delivered on time that is…

Answered: A recent survey showed that from a…

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 recent survey showed that from a sample of 500 packages delivered by a Postal Service, 480 were delivered on time.

Construct a 95% confidence interval for the proportion of all packages that are delivered on time by the Postal Service.
The manager of the Postal Services claims that 98 percent of their mail are delivered on time. Test at the 1% significance level to determine whether the true proportion is less than 98 percent.

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