Question 877876
(a) What is the research objective?


The objective is to determine the true population proportion of those who participate in an employer-sponsored automatic
payroll deduction for a 401(k) plan to save for retirement.

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(b) What is the population?


The population is the entire set of people who work in the United States.


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(c) What is the sample?


The sample is the set of people surveyed. To keep costs low, and be efficient, the sample is smaller than the population. If you were to survey the *entire* population, then it would be very expensive.


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(d) List the descriptive statistics.


The 27% of the sample is the descriptive statistic because it represents the proportion for the sample.


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(e) What can be inferred from this survey? 


The 4% margin of error means that the true proportion is most likely in the range from 23% to 31% (since 27-4 = 23, 27+4 = 31)


We are 95% confident that the true proportion is in this range.