Examples - inferences for one proportion

Examples - inferences for one proportion - confidence...

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Section 7.4 Large-sample C.I. for one population proportion Example A sample of 1010 U.S. employees were asked whether they “play hooky”, that is, called in sick at least once a year when they simply need time to relax. 202 responded “yes”. (a) Use these data to obtain a 95% confidence interval for the proportion, p , of all U.S. employees who play hooky.(Use p ˆ ) (b) Use these data to obtain a 95% confidence interval for the proportion, p , of all U.S. employees who play hooky.(Use p ~ ) (c) Obtain a sample size that will ensure a margin of error at most 0.01 for a 95% confidence interval (without using information given above). (d) Obtain a sample size that will ensure a margin of error at most 0.01 for a 95%
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Unformatted text preview: confidence interval if it is reasonable to presume that the proportion of these sampled who play hooky will be somewhere between 0.1 and 0.3. Section 8.5 Large-sample test of hypothesis for a population proportion Example Of the 2512 U.S. adults who were asked whether they believed that juries almost always convict the guilty and free the innocent, only 578 said that they did. (a) At the 5% significance level, do the data provide sufficient evidence to conclude that less than one in four Americans believe that juries almost always convict the guilty and free the innocent? (z = -2.30) (b) Find the p-value and assess the strength of the evidence against the null hypothesis....
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This note was uploaded on 10/07/2010 for the course ECON 303 taught by Professor Tracey during the Spring '08 term at University of Calgary.

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Examples - inferences for one proportion - confidence...

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