Select only one answer per question 1. You conduct a study in which you compare

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Select only one answer per question 1. You conduct a study in which you compare the blood pressure of three groups of people diagnosed with hypertension, one group taking a standard blood pressure medication, one group taking a new treatment, and a third group assigned to a strict diet and exercise protocol. The patients were allowed to choose which treatment they wanted to try. You measure the patients' blood pressure 6 months after the patients began their treatment. Which would be the best null hypothesis to test using ANCOVA in this study?
A. There is no difference in the mean blood pressure 6 months posttreatment in the three groups after adjusting for pretreatment blood pressure and other potential confounders. B. There is no difference in the probability of having hypertension 6 months after treatment in the three groups. C. There is no difference in the mean blood pressure at 6 months posttreatment in the three groups. D. There is a small difference in the mean blood pressure 6 months posttreatment in the three groups after adjusting for pretreatment blood pressure and other potential confounders. E. None of the above 2. In order to ensure that our data meet the assumption of homogeneity of variance, we want to: A. fail to reject the Levene's test. B. reject the Levene's test. C. look at the correlation between the dependent and independent variables. D. look at the mean square in the ANCOVA table. E. None of the above 3. If the correlation between two variables is r = 0.50, the variance of the residual is _____. A. 36% B. 40% C. 75% D. 64% E. 95% 4. Which of the following is true about the type of variable that can be examined as the dependent variable, or outcome, using ANCOVA? A. The dependent variable must be continuous and normally distributed. B. The dependent variable must be nominal. C. The dependent variable must be dichotomous. D. The mean value of the dependent variable must be equal in all groups. E. None of the above 5. ANCOVA is different from one-way ANOVA in that: A. ANCOVA has more than one dependent variable. B. ANCOVA must have a continuous and normally distributed dependent variable. C. ANCOVA allows you to adjust for continuous covariates. D. ANCOVA does not address hypotheses about differences in means. E. None of the above.
Select only one answer per question 1. You conduct a study in which you compare the blood pressure of three groups of people diagnosed with hypertension, one group taking a standard blood pressure medication, one group taking a new treatment, and a third group assigned to a strict diet and exercise protocol. The patients were allowed to choose which treatment they wanted to try. You measure the patients' blood pressure 6 months after the patients began their treatment. Which would be the best null hypothesis to test using ANCOVA in this study?
A. There is no difference in the mean blood pressure 6 months posttreatment in the three groups after adjusting for pretreatment blood pressure and other potential confounders. B. There is no difference in the probability of having hypertension 6 months after treatment in the three groups. C. There is no difference in the mean blood pressure at 6 months posttreatment in the three groups. D. There is a small difference in the mean blood pressure 6 months posttreatment in the three groups after adjusting for pretreatment blood pressure and other potential confounders. E. None of the above 2. In order to ensure that our data meet the assumption of homogeneity of variance, we want to: A. fail to reject the Levene's test. B. reject the Levene's test. C. look at the correlation between the dependent and independent variables. D. look at the mean square in the ANCOVA table. E. None of the above 3. If the correlation between two variables is r = 0.50, the variance of the residual is _____. A. 36% B. 40% C. 75% D. 64% E. 95% 4. Which of the following is true about the type of variable that can be examined as the dependent variable, or outcome, using ANCOVA? A. The dependent variable must be continuous and normally distributed. B. The dependent variable must be nominal. C. The dependent variable must be dichotomous. D. The mean value of the dependent variable must be equal in all groups. E. None of the above 5. ANCOVA is different from one-way ANOVA in that: A. ANCOVA has more than one dependent variable. B. ANCOVA must have a continuous and normally distributed dependent variable. C. ANCOVA allows you to adjust for continuous covariates. D. ANCOVA does not address hypotheses about differences in means. E. None of the above.
Select only one answer per question 1. You conduct a study in which you compare the blood pressure of three groups of people diagnosed with hypertension, one group taking a standard blood pressure medication, one group taking a new treatment, and a third group assigned to a strict diet and exercise protocol. The patients were allowed to choose which treatment they wanted to try. You measure the patients' blood pressure 6 months after the patients began their treatment. Which would be the best null hypothesis to test using ANCOVA in this study?
A. There is no difference in the mean blood pressure 6 months posttreatment in the three groups after adjusting for pretreatment blood pressure and other potential confounders. B. There is no difference in the probability of having hypertension 6 months after treatment in the three groups. C. There is no difference in the mean blood pressure at 6 months posttreatment in the three groups. D. There is a small difference in the mean blood pressure 6 months posttreatment in the three groups after adjusting for pretreatment blood pressure and other potential confounders. E. None of the above 2. In order to ensure that our data meet the assumption of homogeneity of variance, we want to: A. fail to reject the Levene's test. B. reject the Levene's test. C. look at the correlation between the dependent and independent variables. D. look at the mean square in the ANCOVA table. E. None of the above 3. If the correlation between two variables is r = 0.50, the variance of the residual is _____. A. 36% B. 40% C. 75% D. 64% E. 95% 4. Which of the following is true about the type of variable that can be examined as the dependent variable, or outcome, using ANCOVA? A. The dependent variable must be continuous and normally distributed. B. The dependent variable must be nominal. C. The dependent variable must be dichotomous. D. The mean value of the dependent variable must be equal in all groups. E. None of the above 5. ANCOVA is different from one-way ANOVA in that: A. ANCOVA has more than one dependent variable. B. ANCOVA must have a continuous and normally distributed dependent variable. C. ANCOVA allows you to adjust for continuous covariates. D. ANCOVA does not address hypotheses about differences in means. E. None of the above.

Explanation / Answer

1) C. There is no difference in the mean blood pressure at 6 months posttreatment in the three groups.

2) A. fail to reject the Levene's test.

3) C. 75%

4) B. The dependent variable must be nominal.

5) A. ANCOVA has more than one dependent variable

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Select only one answer per question 1. You conduct a study in which you compare

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Select only one answer per question 1. You conduct a study in which you compare

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