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# Confidence Intervals Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

### Page 1

#### Question 1 1. The quantity that we subtract or add to x-bar (x̄) to obtain a confidence interval for mu (μ) is known as which of the following?

#### Question 2 2. A sample is considered to be small under which of the following circumstances?

#### Question 3 3. The sample size is denoted by:

#### Question 4 4. The number added to or subtracted from the point estimate is known as the:

#### Question 5 5. How does a population differ from a sample?

### Page 2

#### Question 6 6. What are the characteristics used to describe a population?

#### Question 7 7. The sample's mean is denoted by which symbol?

#### Question 8 8. The t distribution is also known as which of the following?

#### Question 9 9. What do p and p-hat denote, respectively?

#### Question 10 10. In the formula for the confidence interval, why do we add and subtract z * s_p-hat from p-hat?

### Page 3

#### Question 11 11. Jia has a sample size of 15. He wants to be able to make inferences about the entire population based on his work. What should he do when calculating his confidence interval?

#### Question 12 12. Why are small sample sizes not recommended for inferential statistics?

#### Question 13 13. For N = 9, what are the degrees of freedom?

#### Question 14 14. What is a statistical value used to determine how far apart the data in a sample (or a population) are?

#### Question 15 15. The _____ is the value of a sample statistic, which is used as an estimate of a population parameter.

### Page 4

#### Question 16 16. The number added to or subtracted from the point estimate is known as the:

#### Question 17 17. What is the minimum number of samples that should be used for a confidence interval calculation using a Z-value statistic?

#### Question 18 18. What do the numbers used to create a confidence interval come from?

#### Question 19 19. Basin Wind & Sky ski resort signs most of its employees to seasonal, full-time roles. Payroll costs vary from year to year based on dates of operation and snow conditions. Which statistical analysis element allows Basin Wind & Sky to assess these fluctuations as normal rather than abnormal?

#### Question 20 20. All Saints Hospital is using internal research to determine where to open a satellite hospital. The Board of Directors votes to place the new facility in Harristonville because they have concluded that ''hospitals perform better financially when placed in suburban communities.'' This conclusion is an example of a:

### Page 5

#### Question 21 21. If Mr. Smith polls 240 people and finds that 112 will vote for Bill Jones, which of the following is true?

#### Question 22 22. About how big a sample size would we need if we wanted a margin of error of no more than 4% (.04)?

#### Question 23 23. The population mean is denoted by which of the following symbols?

#### Question 24 24. The _____ is the value of a sample statistic, which is used as an estimate of a population parameter.

#### Question 25 25. What is the range of numbers in which a population parameter lies considering margin of error?

### Page 6

#### Question 26 26. If the sample size is 100, how many degrees of freedom are there?

#### Question 27 27. Which of the following statements BEST explains why one might utilize the confidence interval?

#### Question 28 28. Samples under the size of _____ should be treated as small sample sizes.

#### Question 29 29. What is a formula for degrees of freedom?

#### Question 30 30. Which of the following can be used to calculate the confidence level?

#### Confidence Intervals Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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