Chapter 10 Quiz

Quiz Summary

0 of 22 Questions completed

Questions:

You have already completed the quiz before. Hence you can not start it again.

Quiz is loading…

You must sign in or sign up to start the quiz.

You must first complete the following:

Results

Quiz complete. Results are being recorded.

Results

0 of 22 Questions answered correctly

Your time:

Average score
Your score

Current
Review
Answered
Correct
Incorrect

Question 1 of 22

1. Question
- a. the probability that a confidence interval does not contain the population parameter
- b. the level of confidence
- c. the level of unbiasedness
- d. the level of consistency
Correct

Incorrect
Question 2 of 22

2. Question
- a. the level of confidence
- b. the probability that a confidence interval will contain the population mean
- c. the probability that a confidence interval will not contain the population mean
- d. the area in the lower tail of the sampling distribution of the sample mean
Correct

Incorrect
Question 3 of 22

3. Question
- a. if we repeatedly draw samples of the same size from the same population, 90% of the values of the sample means x̄ will result in a confidence interval that includes the population mean µ .
- b. there is a 90% probability that the population mean µ will lie between the lower confidence limit (LCL) and the upper confidence limit (UCL).
- c. we are 90% confident that we have selected a sample whose range of values does not contain the population mean µ .
- d. we are 90% confident that 10% the values of the sample means x̄ will result in a confidence interval that includes the population mean µ .
Correct

Incorrect
Question 4 of 22

4. Question
- a. The width of a confidence interval estimate of the population mean narrows when the sample size increases
- b. The width of a confidence interval estimate of the population mean narrows when the value of the sample mean increases
- c. The width of a confidence interval estimate of the population mean widens when the confidence level increases
- d. All of the above statements are true
Correct

Incorrect
Question 5 of 22

5. Question
- a. The sample size needed to estimate a population mean is directly proportional to the population variance
- b. The sample size needed to estimate a population mean is directly proportional to the square of the standard normal cutoff value Zα/2
- c. The sample size needed to estimate a population mean is directly proportional to the square of the maximum allowable error W
- d. All of the above statements are true
Correct

Incorrect
Question 6 of 22

6. Question
- a. becomes wider
- b. remains the same
- c. becomes narrower
- d. none of the above answers is correct
Correct

Incorrect
Question 7 of 22

7. Question
- a. 2.12
- b. 1.82
- c. 2.00
- d. 1.96
Correct

Incorrect
Question 8 of 22

8. Question
- a. 60.92 ± 2.14
- b. 50.92 ± 12.14
- c. 101.84 ± 4.28
- d. 50.92 ± 4.28
Correct

Incorrect
Question 9 of 22

9. Question
- a. 19.76 ± .33
- b. 19.76 ± .66
- c. 9.88 ± 1.32
- d. 4.94 ± 1.32
Correct

Incorrect
Question 10 of 22

10. Question
- a. increase the population standard deviation
- b. increase the sample size
- c. increase the level of confidence
- d. increase the sample mean
Correct

Incorrect
Question 11 of 22

11. Question
- a. 56.34
- b. 62.96
- c. 13.24
- d. 66.15
Correct

Incorrect
Question 12 of 22

12. Question
- a. the average of the sample values
- b. the average of the population values
- c. a single value that is the best estimate of an unknown population parameter
- d. a single value that is the best estimate of an unknown sample statistic
Correct

Incorrect
Question 13 of 22

13. Question
- a. an estimator whose expected value is equal to the parameter
- b. an estimator whose variance is equal to one
- c. an estimator whose expected value is equal to zero
- d. an estimator whose variance goes to zero as the sample size goes to infinity
Correct

Incorrect
Question 14 of 22

14. Question
- a. it is an unbiased estimator
- b. the variance of the estimator is close to one
- c. the expected value of the estimator is known and positive
- d. it is an unbiased estimator and the difference between the estimator and the population parameter grows smaller as the sample size grows larger
Correct

Incorrect
Question 15 of 22

15. Question
- a. a biased estimator
- b. relatively efficient
- c. consistent
- d. relatively unbiased
Correct

Incorrect
Question 16 of 22

16. Question
- a. The sample mean is relatively more efficient than the sample median
- b. The sample median is relatively more efficient than the sample mean
- c. The sample variance is relatively more efficient than the sample variance
- d. All of the above statements are true
Correct

Incorrect
Question 17 of 22

17. Question
- a. it has no variance
- b. it might be unbiased
- c. it might not be relatively efficient
- d. it does not tell us how close or far the point estimate might be from the parameter
Correct

Incorrect
Question 18 of 22

18. Question
- a. a point estimate plus or minus a specific level of confidence
- b. a lower and upper confidence limit associated with a specific level of confidence
- c. an interval that has a 95% probability of containing the population parameter
- d. a lower and upper confidence limit that has a 95% probability of containing the population parameter
Correct

Incorrect
Question 19 of 22

19. Question
- a. The population variance is known
- b. The population mean is known
- c. The population is normally distributed
- d. The confidence level is greater than 90%
Correct

Incorrect
Question 20 of 22

20. Question
- a. the probability that the confidence interval will contain the population mean
- b. the probability that the confidence interval will not contain the population mean
- c. the area in the lower tail or upper tail of the sampling distribution of the sample mean
- d. the level of confidence
Correct

Incorrect
Question 21 of 22

21. Question
- a. A point estimate of the population mean
- b. The standard error of the sampling distribution of the sample mean
- c. The confidence level
- d. The value of the population mean
Correct

Incorrect
Question 22 of 22

22. Question
- a. smaller the probability that the confidence interval will contain the population mean
- b. smaller the value of Zα/2
- c. wider the confidence interval
- d. narrower the confidence interval
Correct

Incorrect

ADMS 2320: FINAL EXAM PREP · Winter 2024

Quiz Summary

Information

Results

Results

Categories

1. Question

2. Question

3. Question

4. Question

5. Question

6. Question

7. Question

8. Question

9. Question

10. Question

11. Question

12. Question

13. Question

14. Question

15. Question

16. Question

17. Question

18. Question

19. Question

20. Question

21. Question

22. Question