PROBLEM # 2: Aptitude test should produce scores with a large amount of variation so that...
Aptitude tests should produce scores with a large amount of variation so that the administrator can distinguish between persons with low aptitude and persons with high aptitude. The standard test used by a certain industry has been producing scores with a standard deviation of 5 points. A new test is tried on 20 prospective employees and produce a sample standard deviation of 8 points. Are scores from the new test significantly more variable than scores from the standard? (Use alpha...
5. MNM Corporation gives each of its employees an aptitude test. The scores on the test are normally distributed with a mean of 75 and a standard deviation of 15. A simple random sample of 25 is taken from a population of 500. a. What are the expected value, the standard deviation, and the shape of the sampling distribution of x? b. What is the probab]lity that the average aptitude test in the sample will be between 70.14 and 82.14?...
Suppose that the scores on a mathem atics aptitude test are normally distributed. If the test results have a mean score of 84 points and a standard deviation of 10.2 points, w hat is the probability that a student from this population scored 89 points or higher on this particular test? (Hint: first compute the Z score.)
5. (20 pts) Suppose that the scores on a mathematics aptitude test are normally distributed. If the test results have a mean score of 84 points and a standard deviation of 10.2 points, what is the probability that a student from this population scored 89 points or higher on this particular test? (Hint: first compute e Z-score.)
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Scores for a common standardized college aptitude test are normally distributed with a mean of 485 and a standard deviation of 114. Randomly selected men are given a Test Prepartion Course before taking this test. Assume, for sake of argument, that the test has no effect. If 1 of the men is randomly selected, find the probability that his score is at least 536. P(X> 536) = Round to 4 decimal places. If 20 of the men are...
Scores for a common standardized college aptitude test are normally distributed with a mean of 499 and a standard deviation of 106. Randomly selected men are given a Test Prepartion Course before taking this test. a. If 1 of the men is randomly selected, find the probability that his score is at least 542.8. P(X> 542.8)- Enter your answer as a number accurate to 4 decimal places. b. If 15 of the men are randomly selected, find the probability that...
Problem 1. 531.1 and standard deviation a-29.4 (2 points) The scores of students on the SAT colloge entrance examinations at a certain high school had a normal distribution with mean (a) What is the probability that a single student randomly chosen from all those taking the test scores 536 or higher? ANSWER For parts (b) through (d), consider a simple random sample (SRS) of 30 students who took the test (b) What are the mean and standard deviation of the...
(2 points) For students in a certain region, scores of students on a standardized test approximately follow a normal distribution with mean u = 543.4 and standard deviation o = 26.9. In completing the parts below, you should use the normal curve area table that is included in your formula packet. (a) What is the probability that a single randomly selected student from among all those in region who took the exam will have a score of 548 or higher?...
Problem Page The human resources department of a consulting firm gives a standard creativity test to a randomly selected group of new hires every year. This year, 70 new hires took the test and scored a mean of 113.1 points with a standard deviation of 14. Last year, 85 new hires took the test and scored a mean of 116.9 points with a standard deviation of 15.3. Assume that the population standard deviations of the test scores of all new...
In the United States, Scholastic Aptitude Test (SAT) scores are used by universities when selecting students for admission. Private companies and high schools offer SAT preparatory courses to help students improve their scores. This has led some people to ask, "Do SAT preparatory classes effectively increase SAT scores?" The following study, cited in a major newspaper, claims that they do (but not by a substantial amount): "A new study . . . shows that [SAT preparatory] classes are effective in...