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In a newspaper or magazine of your choice, find a statistical study that contains an estimated population proportion.

Short Answer

Expert verified

The article was published in the January 21,2006edition:

According to a research, in the year2005.12.5percent of workers are members of unions.

Step by step solution

01

Given information

Given in the question that, we need to find a statistical study that contains an estimated population proportion In a newspaper or magazine of your choice,

02

Explanation

With Asian and European editions, the Wall Street Journal is an English-language international daily newspaper published by Jones and Company, a division of News Corporation, in.

The following article was published in the January21, 2006edition:

According to a research, in the year 2005.12.5percent of workers are members of unions.

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Most popular questions from this chapter

Why is statistical inference generally used to obtain information about a population proportion?

Margin of error=0.02

Confidence level=90%

Educated guess=0.1

(a) Obtain a sample size that will ensure a margin of error of at most the one specified (provided of course that the observed value of the sample proportion is further from 0.5that of the educated guess.

(b). Compare your answer to the corresponding one and explain the reason for the difference, if any.

Suppose that you can make reasonably good educated guesses, p^1gand p^2g, for the observed values of p^1and p^2.

a. Use your result from Exercise 11.132to show that a (1-ฮฑ)-level confidence interval for the difference between two population proportions that has an approximate margin of error of Ecan be obtained by choosing

n1=n2=p^1g1-p^1g+p^2g1-p^2gza/2E2

rounded up to the nearest whole number. Note: If you know likely ranges instead of exact educated guesses for the observed values of the two sample proportions, use the values in the ranges closest to 0.5as the educated guesses.

b. Explain why the formula in part (a) yields smaller (or at worst the same) sample sizes than the formula in Exercise 11.133.

c. When reasonably good educated guesses for the observed values of p^1and p^2can be made, explain why choosing the sample sizes by using the formula in part (a) is preferable to choosing them by using the formula in Exercise 11.133.

Racial Crossover. Refer to Exercise 11.108 and find and interpret a 95% confidence interval for the difference between the stroke incidences of white and African-American elderly.

In this Exercise, we have given the number of successes and the sample size for a simple random sample from a population. In each case,

a. use the one-proportion plus-four z-interval procedure to find the required confidence interval.

b. compare your result with the corresponding confidence interval found in Exercise 11.25-11.30, if finding such a confidence interval was appropriate.

role="math" localid="1651326935007" x=10,n=40,90%level

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