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Chapter 4: Q. T4.1 (page 289)

When we take a census, we attempt to collect data from

a. a stratified random sample.

b. every individual chosen in a simple random sample.

c. every individual in the population.

d. a voluntary response sample.

e. a convenience sample.

Short Answer

Expert verified

The answer to the question is:

(c) Every individual in the population.

Step by step solution

01

Given information

We have been given four options from which we have to select the correct one.

a. a stratified random sample.

b. every individual chosen in a simple random sample.

c. every individual in the population.

d. a voluntary response sample.

e. a convenience sample.

02

Explanation

The population is divided into groups first. A representative sample of each category is included in the total sample.Every individual in the population.

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Most popular questions from this chapter

Cocoa and blood flow A study of blood flow involved 27healthy people aged 18to 72. Each subject consumed a cocoa beverage containing 900milligrams of flavonols daily for 5days. Using a finger cuff, blood flow was measured on the first and fifth days of the study. After 5 days, researchers measured what they called “significant improvement” in blood flow and the function of the cells that line the blood vessels. What flaw in the design of this experiment makes it impossible to say if the cocoa really caused the improved blood flow? Explain your answer.

Do you trust the Internet? You want to ask a sample of high school students the question “How much do you trust information about health that you find on the Internet—a great deal, somewhat, not much, or not at all?” You try out this and other questions on a pilot group of 5students chosen from your class.

a. Explain how you would use a line of Table D to choose an SRS of 5students from the following list.

b. Use line 107to select the sample. Show how you use each of the digits.

Pricey pizza- The cost of a meal might affect how customers evaluate and appreciate food. To investigate, researchers worked with an Italian all-you-can-eat buffet to perform an experiment. A total of139 subjects were randomly assigned to pay either\(4 or\)8 for the buffet and then asked to rate the quality of the pizza on a9-point scale. Subjects who paid \(8 rated the pizza11% higher than those who paid only\)4.

Identify the explanatory and response variables, the experimental units, and the treatments.

Far from home? A researcher wants to estimate the average distance that students at a large community college live from campus. To find out, she surveys a simple random sample of students from the registrar’s database.

a. Will the researcher’s sample result be exactly the same as the true population's mean? Explain your answer.

b. Which would be more likely to produce a sample result closer to the true population value: an SRS of 100students or an SRS of 50students? Explain your answer.

A louse-y situation A study published in the New England Journal of Medicine compared two medicines to treat head lice: an oral medication called ivermectin and a topical lotion containing malathion. Researchers studied 812 people in 376 households in seven areas around the world. Of the 185 households randomly assigned to ivermectin, 171 were free from head lice after 2 weeks, compared with only 151 of the 191 households randomly assigned to malathion.

a. Calculate the difference (Ivermectin – Malathion) in the proportion of households that were free from head lice in the two groups.

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b. There is one dot at 0.09. Explain what this dot means in this context.

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