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1. What Is A Voluntary Response Sample Generally Not Suitable For Statistical Study?

Decent Essays

MATH 120 Statistics

Joshua Hernandez

Homework #1

Section 1.2

1. What is a voluntary response sample?

A sample in which the subjects decide whether to be included in the study.

2. Why is a voluntary response sample generally not suitable for statistical study?

This sample may have a bias resulting from subjects that have a special interest in the subject being studied.

3. What is the difference between statistical significance and practical significance?

Statistical significance is when methods used to reach a conclusion that some findings are effective but common sense may find that findings do not make enough difference to justify a use or to be practical.

6. In the study of the Weight Watchers weight loss …show more content…

The Volkswagen’s slogan received 55% of the 33,160 responses. The Volkswagen slogan was “Relieves gas pains”

Sample is the 33,160 responses. The population seemed to be the entire population. The sample is a voluntary response sample because subscribers could choose to respond or not. It is not likely to be a representation of the greater population.

Section 1.4

3. Using data collected from the FBI and the Bureau of Alcohol, Tobacco, and Firearms, methods of statistics showed that for the different states, there is a correlation between the number of registered automatic weapons and the murder rate. Can we conclude that an increase in the number of registered automatic weapons causes an increase in the murder rate? Can we reduce the murder rate by reducing the number of registered automatic weapons?

No, the association between the two variables does not imply that one causes the other. No, a decrease in registered weapons will not result in a reduced murder rate.

4. Typical surveys involve about 500 people to 2000 people. When author Shere Hite wrote Woman and Love: A Cultural Revolution in Progress, she based conclusions on a relatively large sample of 4500 replies that she received after mailing 100,000 questionnaires to various woman’s groups. Are her conclusions likely to be valid in the sense that they can be applied to the general population of all women? Why or why not.

No, she used a voluntary response

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