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A clinical trial is conducted to compare an experimental medication to placebo to reduce the symptoms of asthma. Two hundred participants are enrolled in the study and randomized to receive either the experimental medication or placebo. The primary outcome is a self-reported reduction of symptoms. Among 100 participants who receive the experimental medication, 38 report a reduction of symptoms as compared to 21 participants of 100 assigned to the placebo.
a. Generate a 95% CI for the difference in proportions of participants reporting a reduction of symptoms between the experimental and placebo groups.
b. Estimate the RR for reduction in symptoms between groups.
c. Estimate the OR for reduction in symptoms between groups.
d. Generate a 95% CI for the RR.
singer suggests that although the right to sell blood does not threaten the formal right to give blood it is
Following are some representative scores. (High scores represent more favorable attitudes.) Calculate for both before and after scores, and write a conclusion based on the standard deviations.
The cell phone industry is growing at a rapid pace. Current estimates suggest that 60% of people have cell phones. Suppose 25 people were randomly and independently sampled.
How to collect and interpret data.
A number of years ago, there was a popular television game show called Let's Make a Deal. The host Monty Hall, would randomly select contestants from the audience and, as the title suggests
A standard deviation of 1.5. The distribution is normal. What proportion of faculty consume an amount between 4 and 6 cups?
a researcher is investigating the effectiveness of a new study-skills training program for elementary school children.
a six-sigma black belt quality control engineer found that in a random sample of 140 printed circuit boards 18 are
Find out sample size needed to be 95 percent confident that, sample proportion of U.K. annual report graphics which are distorted, is within margin of error of .03 of p.
For each of the given quantitative variables, explain whether the variable is continuous or not.- Number of classes a student misses in a week.
What is a hypothesis test? Why do we need to use them to make decisions about relating sample results to the population; why can't we just make our decisions by the sample value?
Standard deviation can be assumed known with Q=.28 What is the 95% confidence interval estimate of the mean undergraduate GPA for students admitted to the top graduate schools?
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