Confidence intervals for proportions of athletes using drugs

Assignment Help Basic Statistics

Reference no: EM13104727

In 2002 the Supreme Court ruled that schools could require random drug tests of students participating in competitive after-school activities such as athletics. Does drug testing reduce use of illegal drugs? A study compared two similar high schools in Oregon. Wahtonka High School tested athletes at random and Warrenton High School did not. In a confidential survey, 7 of 135 athletes at Wahtonka and 27 of 141 athletes at Warrenton said they were using drugs. Regard these athletes as SRSs from the proportions of athletes at similar schools with and without drug testing.

a) You should not use the large sample confidence interval. Why not?

b) The plus four method adds two observations, a success and a failure, to each sample. What are the sample sizes and the numbers of drug users after you do this?

c) Give the plus four 95% confidence interval for the difference between the proportion of athletes using drugs at schools with and without testing.

Reference no: EM13104727

Questions Cloud

Description of confidence interval-population proportion : The proportion of drivers who use seat belts depends on things like age, gender, ethnicity, and local law. As part of a broader study, investigators observed a random sample of 117 female hispanic drivers in Boston

Estimate optimal production run quantity : The Ambrosia Bakery makes cakes for freezing and subsequent sale. The bakery, which operates five days a week, 52 weeks a year, can produce cakes at the rate of 116 cakes per day.

Confidence intervals for proportions of wrist injuries : A study of injuries to in line skaters used data from the National Electronic Injury Surveillance System, which collects data from a random sample of hospital emergency rooms.

Change in operating cycle : Indicate the effect that the following will have on the operating cycle. Use the letter "I" for increase, "D" for decrease and "N" for no change.

Confidence intervals for proportions of athletes using drugs : In 2002 the Supreme Court ruled that schools could require random drug tests of students participating in competitive after-school activities such as athletics.

What are the predictor and response variables : A doctor is doing research on the effects of medicine in a patience body. He randomly selects 10 patients that have been given a medication and records the number of days that have passed since they have taken the drug and concentration of the dru..

Confidence interval and hypothesis testing-proportion : Compute the proportion p (hat) for your sample Show your computation. Find a 95% confidence interval for p. What is the margin of error in this confidence interval? What is the meaning of this interval with respect to your data and project?

How external analysis change perspective-antebellum slavery : Tell, usually, how these factors influenced on slave life. Then, describe how the external analysis has or has not changed your perspective of antebellum slavery.

Define long-run cost minimization problem for firm : Determine the relationship between and returns to scale and obtain the long-run input demand functions and the total cost function.

User Account

All Pages