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Chapter 1: Q 1.12 (page 23)

1.12Determine the type of sampling used (simple random, stratified, systematic, cluster, or convenience). A high school principal polls 50freshmen, 50sophomores, 50juniors, and 50seniors regarding policy changes for after-school activities.

Short Answer

Expert verified

To determine the type of sampling method used

Step by step solution

01

Step 1: Given Information 

A high school principal polls50freshmen, 50sophomores, 50juniors, and50seniors regarding policy changes for after-school activities.

02

Explanation

The population is comprised of all the students at the school. This includes students in different classes. Strata are divided into classes. Students from different classes make up the entire population, which is heterogeneous. Because there is only one type of student in each stratum, each stratum is homogeneous. Thus, freshmen are in one strata, sophomores in another, and so on. Fifty students are selected from each stratum to constitute the final sample. Again, the final sample is heterogeneous, so it represents the population as a whole. This method is called stratified sampling.

03

Final answer 

The final sample is heterogenous and thus represents the total population. This method is described as stratified sampling.

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Most popular questions from this chapter

Discuss potential violations of the rule requiring informed consent.

a. Inmates in a correctional facility are offered good behavior credit in return for participation in a study.

b. A research study is designed to investigate a new children鈥檚 allergy medication.

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A question on a survey reads: "Do you prefer the delicious taste of Brand X or the taste of Brand Y?" Is this a fair question?

Use the following information to answer the next seven exercises: Studies are often done by pharmaceutical companies to determine the effectiveness of a treatment program. Suppose that a new AIDS antibody drug is currently under study. It is given to patients once the AIDS symptoms have revealed themselves. Of interest is the average (mean) length of time in months patients live once starting the treatment. Two researchers each follow a different set of 40 AIDS patients from the start of treatment until their deaths. The following data (in months) are collected.

Researcher A: 3; 4; 11; 15; 16; 17; 22; 44; 37; 16; 14; 24; 25; 15; 26; 27; 33; 29; 35; 44; 13; 21; 22; 10; 12; 8; 40; 32; 26; 27; 31; 34; 29; 17; 8; 24; 18; 47; 33; 34

Researcher B: 3; 14; 11; 5; 16; 17; 28; 41; 31; 18; 14; 14; 26; 25; 21; 22; 31; 2; 35; 44; 23; 21; 21; 16; 12; 18; 41; 22; 16; 25; 33; 34; 29; 13; 18; 24; 23; 42; 33; 29

Can you tell if one researcher is correct and the other one is incorrect? Why?

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