Principles of Economics
Principles of Economics
7th Edition
ISBN: 9781305156043
Author: N. Gregory Mankiw
Publisher: Cengage Learning US
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Chapter 32, Problem 8PA
To determine

The impact of increased real interest rate in Europe on the US.

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A statistics teacher wants to see if there is any difference in the performance of students on the final exam if she gives them orange jelly beans before the exam. She has a theory that orange jelly beans will change the results, but she isn't sure in which direction. She knows that the population mean score on the exam when students do not have orange jelly beans is 85 and that exam scores have an approximately symmetric distribution. She gives orange jelly beans to 25 randomly selected students and finds that these students had a sample mean score of 88 with a sample standard deviation of 5. She wants to have 99% confidence in her result.
A statistics teacher wants to see if there is any difference in the performance of students on the final exam if she gives them orange jelly beans before the exam. She has a theory that orange jelly beans will change the results, but she isn't sure in which direction. She knows that the population mean score on the exam when students do not have orange jelly beans is 85 and that exam scores have an approximately symmetric distribution. She gives orange jelly beans to 25 randomly selected students and finds that these students had a sample mean score of 88 with a sample standard deviation of 5. She wants to have 99% confidence in her result.
You take a random sample of five City College students and record what color shirt they are wearing. Here are the results: Black Blue Blue Blue Black Calculate a point estimate for the population proportion of City College students who wear blue shirts on any particular day, based on the data in this sample. Give the symbol used to denote this point estimate and the numerical value of the point estimate.
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