Explanation Given: A survey asked, “Do you think that the president is doing a good job?” Of the 1 , 200 Americans surveyed, 800 responded yes. Approach: The formula for proportion is, p = x n … ( 1 ) Here, x denotes the people of a particular type, n denotes the total people. The formula for margin of error is, M O E = z α 2 2 n … ( 2 ) Here, M O E denotes the margin of error. Calculation: From the given information, x = 800 , n = 1 , 200 . Substitute 800 for x , 1 , 200 for n in equation ( 1 ) . p = 800 1 , 200 = 0.66 Now, α = 0 To determine (c) To find: The margin of error with a 95 % level of confidence.

8th Edition

ISBN: 9780357425831

Author: Johnson

Publisher: CENGAGE L

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.

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Chapter 4.CR, Problem 16CR

To determine

(a)

To find:

The sample proportion and the margin of error with a 90% level of confidence.

To determine

(c)

To find:

The margin of error with a 95% level of confidence.

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Chapter 4.CR, Problem 15CR

Chapter 4.CR, Problem 17CR

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(a) To find: The sample proportion and the margin of error with a 90 % level of confidence.

Solution Summary: The author explains the sample proportion and the margin of error with a 90% level of confidence.

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(a)

To find:

The sample proportion and the margin of error with a 90% level of confidence.

(c)

To find:

The margin of error with a 95% level of confidence.

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Chapter 4 Solutions

(a) To find: The sample proportion and the margin of error with a 90 % level of confidence.

Solution Summary: The author explains the sample proportion and the margin of error with a 90% level of confidence.

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(a) To find: The sample proportion and the margin of error with a 90% level of confidence.

(c) To find: The margin of error with a 95% level of confidence.

Want to see the full answer?

Chapter 4 Solutions

(a)

To find:

The sample proportion and the margin of error with a 90% level of confidence.

(c)

To find:

The margin of error with a 95% level of confidence.