23 Jun What is the correlation between
What is the correlation between cholesterol levels and the risk of suffering a heart attack?
Answer: ___________
What is the coefficient of determination for the value in the previous question? Round to the thousandths place.
Answer: ___________
Scenario 6
Suppose that you wanted to determine if a dietary supplement is effective at lowering blood pressure. You randomly select 200 people with slightly elevated blood pressure and give them either a placebo or the dietary supplement. Your research design is as follows in Table 1. You randomly select 100 people to receive the dietary supplement, and 100 people to receive the placebo. In order to determine the effectiveness of the dietary supplement, you measure systolic blood pressure. The drug was considered a success if it reduced blood pressure levels below 130 mm Hg. Your research hypothesis is: The dietary supplement will reduce blood pressure compared to placebo in people with moderately high blood pressure levels.
Table 1. Dietary Supplements and Lowering Blood Pressure
Blood pressure below 130mmHg Blood Pressure above 130 mm Hg
Placebo
n=100 20 people 80 people
Dietary Supplement
N=100 30 people 70 people
What is the null hypothesis equation for this experiment?
Answer: ___________
What proportion of people that received the placebo control had their blood pressure reduced at the end of the study?
Answer: ___________
What proportion of people that received the placebo control had their blood pressure reduced at the end of the study?
Answer: ___________
What statistical test would you use?
A 2 proportion z-test
B ANOVA
C Relative Risk
D 2 sample t-test
Answer: ___________
Based on the statistical test you chose, do you accept or reject the null hypothesis at P=0.05? Please paste your data output file in the area below.
Answer: ___________
What is the 95% confidence interval for this experiment?
Answer: ___________
What is the power of this statistical test? Please paste your data output file in the space below.
Answer: ___________
Assuming that the expected proportions remain the same for the two groups, how many samples are needed to achieve a power level of 0.80?
Answer: ___________
Which of the following statements is correct about why you would use the Yates continuity correction when performing a Power analysis?
A To increase your chances of making a type I error.
B To decrease your chances of making a type I error.
C To increase your chances of making a type II error.
D To decrease your chances of making a type II error.
Answer: ___________
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