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Zathrae May

Zathrae M.

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Madhur L verified

Numerade educator

Supposed the data are SAT scores and follow a normal distribution with a ? = 500 and ? = 100. a. What percent of the population obtains scores of 410 or less? b. What is the minimum score needed to rank in the top 5% of the populations? c. A psychologist wishes to test a new learning strategy on the bottom 15% of those who took the Math SAT. What cut-off score should she use to select participants for her study?

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INSTANT ANSWER

Supposed the data are SAT scores and follow a normal distribution with a ???? = 500 and ???? = 100. a. What percent of the population obtains scores of 410 or less? b. What is the minimum score needed to rank in the top 5% of the populations? c. A psychologist wishes to test a new learning strategy on the bottom 15% of those who took the Math SAT. What cut-off score should she use to select participants for her study?

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ANSWERED

Madhur L verified

Numerade educator

At the end of a quarter, Carol took four final exams. The mean and standard deviation for each exam along with Carol's grade on each exam are listed below. Assume that the grades on each exam are normally distributed. Exam Mean Standard Deviation Carol's Grade Language 75 6.3 78 History 85 4.1 83 Psychology 88 3.5 89 Statistics 70 8.6 83 a. On which exam did Carol do best relative to the other students taking the exam? b. What was her percentile rank on this exam?

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For each conjecture, state the null and alternative hypothesis. 1. The average age of community college students is 18.6 years. 2. The average income of accountants is Php 107,285.54. 3. The average age of attorneys is greater than 25.4 years. 4. The average score of high school basketball games is less than 88. 5. The average pulse rate of male marathon runners is less than 70 beats per minute. 6. The average cost of a DVD player Php 3,997.50. 7. The average weight loss for a sample of people who exercise 30 minutes per day for 6 weeks is 8.2 pounds. 8. The average age of graduating students in college is 21.5 years. 9. The average salary of Public-School Teacher (entry level) is Php 21,899. 10. The average time spent using cellphone is 4 hours and 30 minutes.

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