Answered: In a survey of n = 400 randomly…

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

100%

In a survey of n = 400 randomly selected Americans, a polling organization asked: "Do you favor eliminating Saturday mail delivery to lower the price of a postal stamp?" In the sample, 54% answered "yes" and the margin of error was reported to be plus or minus 5%. Which statement about the margin of error is correct?

Group of answer choices

There's a 95% chance the sample and population proportions differ by more than 5%.

There's a 95% chance that the population proportion is 54%.

There's a 95% chance the sample and population percentages differ by exactly 5%.

There's a 95% chance the sample and population proportions differ by less than 5%.

A national poll wants to determine what percent of all Americans favor a change in delivery to reduce the cost of postal stamps. A random sample of 1000 Pennsylvanians was obtained from a list of all Pennsylvanians. What is the major problem with this survey?

Group of answer choices

used the wrong sampling frame.

obtained a volunteer sample.

obtained a convenience sample.

failed to obtain a complete census

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