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Question: Drug for Rheumatoid Arthritis Read the portion of the abstract of a scientific study that appears below, and then answer the questions that follow. "Methods: In this double-blind, placebo-controlled study, 611 patients were randomly assigned, in a 4:4:1 ratio, to [receive] 5 mg of tofacitinib twice daily, 10 mg of tofacitinib twice daily, or placebo. The primary end point, assessed at month 3, was the percentage of patients with at least a 20% improvement on the American College of Rheumatology scale (ACR 20), Results: At month 3, a higher percentage of patients in the tofacitinib groups than in the placebo groups met the criteria for an ACR 20 response (59.8% in the 5-mg tofacitinib group and 65.7% in the 10-mg tofacitinib group vs. 26.7% in the placebo group, P 6 0.001 for both comparisons)."a. Identify the treatment variable and the response variable.
b. Was this a controlled experiment or an observational study? Explain.
c. Do the sample percentages suggest that the drug was effective in achieving a 20% reduction in symptoms?
d. What does the small p-value show?
e. Can you conclude that the use of tofacitinib increases the chances of a 20% improvement in symptoms? Why or why not?
The useful life (in hours) of a certain kind of integrated circuit is a random variable having the probability density
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Site preparation for new housing developments for tracts of 40 houses is normally distributed with a mean of 250 workdays and a standard deviation of 25 workdays.
the probability density function of the net weight in pounds of a packaged chemical herbicide is fx 2.0 for 49.75 lt
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Test the hypothesis that the median weight of NFL players is 250 pounds against the alter- native that it is greater at α = 0.05, using (a) the large sample sign test and (b) the Wilcoxon signed rank test.
let x and y be continuous random variables with the joint probability density functionfxy 6x if xgtor equals 0 ygt or
A university's leadership council is made up of 14 members 5 are students 4 are teachers, and 5 are deans. A newspaper reporter is planning to select two of the council members for interviews.
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a report states that 57 of home owners had a vegetable garden. how large a sample is needed to estimate the true
at a local panda express you can choose one base item from four possibilities rice fried rice vegetable noodles and
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