University of the People STATS HS4510 1)A chi-square test that investigated the above associations (in Q2) found a chi-square statistic of 16

University of the People

STATS HS4510

1)A chi-square test that investigated the above associations (in Q2) found a chi-square statistic of 16.87. Based on the degrees of freedom and the chi-square critical value in chi-square statistical distribution table, will you reject or accept the null hypothesis?

2. A confidence interval is estimated to:

3. A measure of reliability that is estimated by measuring the correlations of each item in a measure with every other item is known as:

4. A measure was found to be normally distributed with a mean of 200 and a variance of 64. Calculate approximately what

5. A measure was reported to have a z score of 1.35. This means that that value is exactly 1.35 standard deviations above the mean.

: State if true or false:

6. A multivariable regression cannot have more than one outcome although it can have multiple covariates.

: State if true or false.

7. A non-parametric test is less powerful than a parametric test. (Power here indicates statistical power to detect a difference if that difference exists).

8. A paired or matched study has more statistical power than a non-paired or non-matched design. Choose the best answer.

9. A researcher calculated the 90%, 95%, and 99% confidence intervals (CI) for a mean difference comparing pre- and post- intervention measurements on a randomly selected sample. Which of these confidence intervals has the lowest Type 1 error?

10. A researcher decided to decrease the sample size by half while keeping everything else unchanged. By doing this, the confidence intervals will:

11. A researcher decided to increase the size of the sample size while keeping everything else the same. By increasing the sample size, the width of the confidence interval will:

12. A researcher developed a new truth detector device. Then she tested whether this new device truly detect whether a person is saying the truth or not. Her testing relates to:

13. A researcher developed a questionnaire and she asked two of her colleagues to independently collect data. Later she compared the results from both colleagues. In this case, she was testing the:

14. A researcher randomly selected 50 individuals and measured their pulse. This was repeated 5 times. The purpose was to estimate the mean pulse that was a close estimate to the population pulse. In each of five time the researcher calculated the mean, what was the degrees of freedom for deviations from the mean?