The National Collegiate Athletic Association (NCAA) measures the Graduation Success Rate (GSR), which is the percentage of eligible athletes who graduate within six years of entering college. According to the NCAA, the GSR for all scholarship athletes in a particular division is \( 63 \% \). The GSR for all students in this division is \( 59 \% \). Complete parts a and \( \mathbf{b} \). a. Suppose the NCAA report was based on a sample of 500 student-athletes, of which 315 graduated within six years. Is this sufficient information to conclude that the GSR for all scholarship athletes in this division differs from \( 59 \% \) ? Test using \( \alpha=0.01 \). What are the hypotheses for this test? A. \( H_{0}: p=0.59 ; H_{a}: p \neq 0.59 \) B. \( H_{0}: p \neq 0.59 ; H_{a}: p=0.59 \) c. \( H_{0}: p=0.59 ; H_{a}: p<0.59 \) D. \( H_{0}: p=0.59 ; H_{a}: p>0.59 \) Find the rejection region for the test. Choose the correct answer below. A. \( z<-2.575 \) B. \( z<-2.33 \) or \( z>2.33 \) c. \( z>2.575 \) D. \( z>2.33 \) E. \( z<-2.33 \) F. \( z<-2.575 \) or \( z>2.575 \) Calculate the value of the test statistic. \( z= \) \( \square \) (Round to two decimal places as needed.)
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The null hypothesis (H0) is that the true proportion of student-athletes who graduate is the same as the overall student graduation rate, which is 59%. The alternative hypothesis (Ha) is that the true proportion of student-athletes who graduate is not equal to Show more…
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The National Collegiate Athletic Association (NCAA) measures the Graduation Success Rate (GSR), which is the percentage of eligible athletes who graduate within six years of entering college. According to the NCAA, the GSR for all scholarship athletes in a particular division is 59%. The GSR for all students in this division is 64%. Suppose the NCAA report was based on a sample of 500 student-athletes, of which 295 graduated within six years. Is this sufficient information to conclude that the GSR for all scholarship athletes in this division differs from 64%? Carry out the test using a Type I error rate of 0.01. Ho: p = 0.64 Ha: p ≠ 0.64 What is the rejection region? Select the correct choice below and fill in the answer box(es) to complete your choice (Round to two decimal places as needed) z < -2.58 or z > 2.58 Calculate the value of the z-statistic for this test. z = (Round to two decimal places as needed)
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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 the 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, 5 out of 122 athletes at Wahtonka and 20 out of 116 athletes at Warrenton said they were using drugs. Regard these athletes as simple random samples from the populations of athletes at similar schools with and without drug testing. (a) You should not use the large-sample confidence interval. Why not? Choose a reason. The sample sizes are too small. The sample sizes are not identical. The sample proportions are too small. At least one sample has too few failures. At least one sample has too few successes. (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? Wahtonka sample size: _____ Wahtonka drug users: ______ Warrenton sample size: ______ Warrenton drug users: ______ (c) Give the plus four 95% confidence interval for the difference between the proportion of athletes using drugs at schools with and without testing. Interval: _______ to _______
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