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A clinical trial is conducted to compare an experimental medication to the placebo to reduce the symptoms of asthma. 200 participants are enrolled in the study and randomized to recieve either the experimental medication or placebo. The primary outcome is a self-reported reduction of symptoms. Among 100 participants who received the experimental medication, 38 reported a reduction of symptoms as compared to 21 participants of 100 assigned to the placebo.
a. Generate a 95% CI for the difference in proprotions of particpants reportinga reduction of symptoms between the experimental and placebo groupsb. Estimate the relative risk for the reduction in the symptoms between groups.c. Estimate the odds ratio for reduction in symptoms between groups.d. Generate a 95% CI for the Relative Risk.
What should the cut-off score be for the interviews? (Round to nearest whole number).
A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 175 and a standard deviation of 15. If an applicant is randomly selected, find the probability of a rating that is between 150 and 200.
Consider the following time plot of the values of variable Y for each month of a 60-month period. This plot displays
The probability Mary will receive an A in a class is 0.70. Assuming independence, if she is taking 5 classes this semester, calculate the probability she will receive exactly 3 A's.
A sociologist wants to determine if the life expectancy of people in Africa is less than the life expectancy of people in Asia.
In a poll of 1049 adults, it was found that 21% smoked cigarettes in teh past week. Use a 0.05 significance level to test the claim that less than 25% of adults have smoked within the past week.
Estimate the minimum sample size necessary to estimate the true mean grams of fat to within plus or minus 2 grams with 98 percent confidence.
Individual loss amounts (ground up) this year follow an inverse Weibull distribution with τ= 3 and expected value 1000. Next year you con?fidently expect loss amounts to in?ate by 10% uniformly across the board.
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
A recent article in Business Week listed the "Best Small Companies." We are interested in the current results of the companies' sales and earnings.
Find the probability that one or more of the five parolees will be repeat offenders. (Round your answer to three decimal places.)
Do the data indicate that the sleeping pill is effective at a 1% level of significance?
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