Saint Elizabeth Confidence Interval for The Population Proportion Questions

Question Description

Ms. Wilson is considering running for mayor of the town of Bear Gulch. Before completing the petitions, she decides to conduct a survey of voters in Bear Gulch. A sample of 200 voters reveals that 150 would support her in the November election. Develop a 99 percent confidence interval for the population proportion and interpret your finding.
We want to estimate the population mean within 5, with a 95 percent level of confidence. The population standard deviation is estimated to be 10. How large a sample is required?

At the time she was hired as a server Beth was told, “You can average more than $25 a day in tips.” Over the first 25 days she was employed at the restaurant, the mean daily amount of her tips was $24, with a standard deviation of $3. At the .05 significance level, can Beth conclude that she is earning an average of more than $25 in tips?
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