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For each of the following sampling situations, identify the population as exactly as possible. Specify what kind of individuals the population consists of and exactly which individuals fall within the population. If the information given is not complete, provide a reasonable completion of the population description.

a. A college has changed its core curriculum and wants to obtain detailed feedback information from students during each of the first 12 weeks of the coming semester. Each week, a random sample of 5 students will be selected to be interviewed.

b. The American Community Survey (ACS) will replace the census "long form" starting with the 2010 census. The main part of the ACS contacts 250,000 addresses by mail each month, with follow-up by phone and in person if there is no response. Each household answers questions about their housing, economic, and social status.

c. An opinion poll contacts 1161 adults and asks them, "Which political party do you think has better ideas for leading the country in the twenty-first century?"

Answer :

Here are the options that complete the questions;

For question 1. (a):

A) The population is all current students.

B) The population is students in the college during the first 12 weeks of the coming semester.

C) The population is the 60 students selected during the first 12 weeks of the coming semester.

D) The population is students in the coming semester.

For question 2. (b):

A) The population is 250,000 households.

B) The population is all U.S. households.

C) The population is all households that are being contacted by the ACS.

D) The population is U.S. households in 2010.

For question 3. (c):

A) The population is 1161 U.S. adults that supply information.

B) The population is all adult residents of the U.S.

C) The population is political parties.

D) None of the above.

Answer:

For question 1. (a) = B) The population is students in the college during the first 12 weeks of the coming semester.

For question 2. (b): = D) The population is U.S. households in 2010.

For question 3. (c): = B) The population is all adult residents of the U.S.

Explanation:

a) We can conclude that the research population would consist of students in the college during the first 12 weeks of the coming semester because students that failed to register for the 12 weeks of the coming semester are would not be counted in the random sample selection process.

b) The American Community Survey (ACS) as the name implies serves the entire American community; thus the population of the census is all U.S. households in 2010.

c) Although 1161 adults are been contacted, they do not represent the entire population, but just a sample out of all adult residents of the U.S.

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Rewritten by : Barada

Final answer:

The college's population for feedback on the core curriculum consists of all enrolled students; the ACS targets all U.S. residential addresses; and the political opinion poll's population includes all adults in the nation. Each study requires a sample that accurately represents its respective population.

Explanation:

When identifying the populations from the given sampling situations, it's important to be as precise as possible. For instance:

In situation (a), where a college is seeking to evaluate a new core curriculum through weekly interviews with students, the population consists of all students enrolled at the college during that semester. To obtain a random sample, each student at the college must have an equal chance of being selected each week.

For situation (b), where the American Community Survey (ACS) replaces the census long form, the population includes all U.S. residential addresses. Here, a stratified random sample is implied, to ensure representation across various geographic, economic, and social strata.

In situation (c), where an opinion poll asks adults about their political party preferences, the population encompasses all adults in the country. The poll aims to achieve a representative sample that matches the demographic distribution of the overall adult population.

The effectiveness of these studies relies heavily on how well the sample represents the larger population. Ensuring each individual within the population has an equal opportunity for selection is critical for the integrity of the findings.