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You work for a research company. You want to determine whether U.S. adults support more funding for alternative energy. Using the Sample Size Calculator, choose a 95% confidence level and a 3% margin of error. How many people should you survey to obtain reliable results? (See Example 5.)
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Using the Sample Size Calculator located in Tools, you can see that you need to survey 1068 people to obtain reliable results.
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You work for a research company. You want to determine whether U.S. adults support more funding for alternative energy. Using the Sample Size Calculator, choose a 99% confidence level and a 3% margin of error. How many people should you survey to obtain reliable results? Compare this sample size to the sample from Exercise 13. What happens when the confidence level increases? Explain. (See Example 5.)
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You work for a research company. You want to determine whether U.S. adults support more funding for alternative energy. Using the Sample Size Calculator, choose a 95% confidence level and a 5% margin of error. How many people should you survey to obtain reliable results? Compare this sample size to the sample size from Exercise 13. What happens when the margin of error increases? Explain. (See Example 5.)
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Using the Sample Size Calculator located in Tools, you can see that you need to survey 385 people to obtain reliable results.
Notice that when the margin of error increases, the sample size needed decreases.
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Determine which question might produce biased results. Explain. (See Example 6.)
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Determine which question might produce biased results. Explain. (See Example 6.)
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Sample answer:
The first question could produce biased results because it states that the policy is unfair and the project is time-consuming whereas the second question does not offer an opinion and is more impartial.
These comments are not screened before publication. Constructive debate about the information on this page is welcome, but personal attacks are not. Please do not post comments that are commercial in nature or that violate copyright. Comments that we regard as obscene, defamatory, or intended to incite violence will be removed. If you find a comment offensive, you may flag it.
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Determine which question might produce biased results. Explain. (See Example 6.)
These comments are not screened before publication. Constructive debate about the information on this page is welcome, but personal attacks are not. Please do not post comments that are commercial in nature or that violate copyright. Comments that we regard as obscene, defamatory, or intended to incite violence will be removed. If you find a comment offensive, you may flag it.
When posting a comment, you agree to our Terms of Use.