Quantitative Methods PSY302 Quiz Chapter Six Confidence Intervals

1. Quantitative Methods PSY302Quiz Chapter SixConfidence Intervals

2. 1. We calculate the sample mean in order to: • practice with Excel • prove the null hypothesis • create sampling error • decrease confirmation bias • estimate the population mean

3. 1. We calculate the sample mean in order to: • practice with Excel • prove the null hypothesis • create sampling error • decrease confirmation bias • estimate the population mean

4. 2. A range of valueswithin which the true mean of the population is believed to exist is called a. (105) • standard deviation • non random sample • research design or meta-analysis • frequency distribution • confidence interval

5. 2. A range of valueswithin which the true mean of the population is believed to exist is called a. (105) • standard deviation • non random sample • research design or meta-analysis • frequency distribution • confidence interval

6. 2.58 -1.11 1.96 .002 .5 3. The Z score for a 95% confidence interval is: (107)

7. 2.58 -1.11 1.96 .002 .5 3. The Z score for a 95% confidence interval is: (107)

8. frequency raw score the variance the mean all of the above 4. In the sampling distribution of means shown below what is on the X axis?

9. frequency raw score the variance the mean all of the above 4. In the sampling distribution of means shown below what is on the X axis?

10. 5. I have an estimate based on a mean of 50 with a margin of error of 10. What would be the upper limit of my confidence interval? • 35 • 60 • 55 • 40 • 50

11. 5. I have an estimate based on a mean of 50 with a margin of error of 10. What would be the upper limit of my confidence interval? • 35 • 60 • 55 • 40 • 50

12. 6. For a 95% confidence interval, the formula for the margin of error is the Z-score (i.e. 1.96) times: • μ • .95 • the standard error • sample mean • population mean

13. 6. For a 95% confidence interval, the formula for the margin of error is the Z-score (i.e. 1.96) times: • μ • .95 • the standard error • sample mean • population mean

14. 7. As n increases the standard error: (111) • remains the same • increases • decreases • doubles • turns to zero

15. 7. As n increases the standard error: (111) • remains the same • increases • decreases • doubles • turns to zero

16. 8. When you divided the standard deviation of the population by the square root of n (the sample size) you have the: • standard error • mean • correlation coefficient • confidence interval • sum of squares

17. 8. When you divided the standard deviation of the population by the square root of n (the sample size) you have the: • standard error • mean • correlation coefficient • confidence interval • sum of squares

18. never always 99% of the time 95% of the time On president’s day 9. A 95% confidence interval is constructed so that it will capture the true mean of the population: (115) The error bars on the figures represent the 95 percent confidence interval.

19. never always 99% of the time 95% of the time On president’s day 9. A 95% confidence interval is constructed so that it will capture the true mean of the population: (115) The error bars on the figures represent the 95 percent confidence interval.

20. value of the mean Z score the number of standard errors above or below the mean all of the above 10. The X axis of a sampling distribution of the means shows the:

21. value of the mean Z score the number of standard errors above or below the mean all of the above 10. The X axis of a sampling distribution of the means shows the:

22. The End

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