Hard times In June 2010, a random poll of 800 workingmen found that 9% had taken on a second job to help paythe bills. (www.careerbuilder.com)a) Estimate the true percentage of men that are taking onsecond jobs by constructing a 95% confidence interval.b) A pundit on a TV news show claimed that only 6% of working men had a second job. Use your confi-dence interval to test whether his claim is plausible given the poll data.

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Q: When you construct a 95% confidence interval, what are you 95% confident about?

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Q: Give a real life example of how confidence intervals are used.

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Q: Briefly describe the relationship between confidence interval and hypothesis testing.

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Q: Isabel Myers was a pioneer in the study of personality types. In a study of personality…

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Q: Suppose you want to construct a 95% confidence interval for the difference

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.