Preview File Edit View Go Tools Window Help 0 0 7 18% Thu 4:04 PM Q DE . . practice set 102 (page 1 of 2) ~ Q. Search ED 7 Av Q practice set 102 -I-Fall2 Practice set Question #1 police entrance exam among new recruits has an average score of 80 points, with a standard deviation of 7.5 points. What is the standard score for a raw score of 60? What is the standard score for a raw score of 110? poop What is the probability that an officer will score higher than 85 on the exam? What is the probability that an officer will score between 70 & 90 on the exam? e . Departmental awards are given to officers who score in the top 8 percent of new recruits. what is the minimum score an officer must earn in order to receive an award? Question #2: Suppose that homicide rates in the U.S. are normally distributed with mean 7.11 per 100,000, and variance of 4.14 a. At its peak in the 1990's, the U.S. homicide rate reached 10.2 per 100,000. What is the probability that the homicide rate would exceed this value? What homicide rates lie in the lowest 20% of the distribution? Question #3: In a sample of 9,450 youths, the mean number of delinquent acts is 2.30, with a standard deviation of 3.25. Assume that the number of delinquent acts is normally distributed. al Construct a 95% confidence interval around this point estimate. Provide a written interpre- tation for this confidence interval. b Construct a 99% confidence interval around this point estimate. Provide a written interpre- tation for this confidence interval. Compare the ranges of these intervals - how much larger is the 99% confidence interval relative to the 95% confidence interval (in percentage terms!). us + Question #4 uppose that state-level unemployment rates are normally distributed with mean