Homework Answers
z score for top 10% area = 1.28
Hence,
Minimum grade required for A = 530 + 1.28*80 = 632
Option A is correct.
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Question 3 of 13 An instructor in a large lecture class found, at the end of the semester, that the total point dis...
QUESTION 3 An instructor of an extremely large class (1000 students) starts grading an exam. After...
QUESTION 3 An instructor of an extremely large class (1000 students) starts grading an exam. After grading 100 of the assignments he calculates the sample average as 80 with a standard deviation of 10, He then correctly determines that he can 95% confident that the average student score is between 78.04 and 81.96. He continues grading, and after grading a total of 400 exams the sample average is 80 with a sample deviation of 20. How confident is he that...
3. Exam grades across all students across all sections of an introductory statistics class are approximately...
3. Exam grades across all students across all sections of an introductory statistics class are approximately normally distributed with a mean of 72 and a standard deviation of 11. Use the normal distribution to find answer the following questions. a. What percent of students scored above a 90%? b. What percent scored below 60%? c. If the lowest 5% of students will be required to attend an extra study session, what grade is the cutoff for being required to attend...
A Waist is a Terrible Thing to Mind: The waist circumference of males 20 to 29...
A Waist is a Terrible Thing to Mind: The waist circumference of males 20 to 29 years ele is approximately normally distributed, with mean 92.5 cm and standard deviation 13.5 Source: M.A. McDowell. CD. Fryar.R. Hirs for Children and Adults: U.S. Population. 1999-2002. Advance data from vital and health statistics: No. 361. Hyattsville, MD: National Center for Health Statistics, 2005. d CL. Ogden, Anthropometric Reference Data 5. Draw a normal curve with the parameters labeled. 92.5 What proportion of 20-...
photos for each question are all in a row (1 point) In the following questions, use...
photos for each question are all in a row
(1 point) In the following questions, use the normal distribution to find a confidence interval for a difference in proportions pu - P2 given the relevant sample results. Give the best point estimate for p. - P2, the margin of error, and the confidence interval. Assume the results come from random samples. Give your answers to 4 decimal places. 300. Use 1. A 80% interval for pı - P2 given that...
QUESTION 3 An instructor of an extremely large class (1000 students) starts grading an exam. After grading 100 of the assignments he calculates the sample average as 80 with a standard deviation of 10, He then correctly determines that he can 95% confident that the average student score is between 78.04 and 81.96. He continues grading, and after grading a total of 400 exams the sample average is 80 with a sample deviation of 20. How confident is he that...
A Waist is a Terrible Thing to Mind: The waist circumference of males 20 to 29 years ele is approximately normally distributed, with mean 92.5 cm and standard deviation 13.5 Source: M.A. McDowell. CD. Fryar.R. Hirs for Children and Adults: U.S. Population. 1999-2002. Advance data from vital and health statistics: No. 361. Hyattsville, MD: National Center for Health Statistics, 2005. d CL. Ogden, Anthropometric Reference Data 5. Draw a normal curve with the parameters labeled. 92.5 What proportion of 20-...
photos for each question are all in a row
(1 point) In the following questions, use the normal distribution to find a confidence interval for a difference in proportions pu - P2 given the relevant sample results. Give the best point estimate for p. - P2, the margin of error, and the confidence interval. Assume the results come from random samples. Give your answers to 4 decimal places. 300. Use 1. A 80% interval for pı - P2 given that...
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