Statistics: Concepts and Controversies
9th Edition
ISBN: 9781464193026
Author: Moore
Publisher: MAC HIGHER
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Chapter 9, Problem 19E
To determine
To find: The percentage drop of Industrial Average of Dow Jones on September 29, 2008.
To determine
To find: The percentage drop of Industrial Average of Dow Jones on October 28, 1929.
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From a sample of 26 graduate students, the mean number of months of work experience prior to entering an MBA program was 34.67. The national standard deviation is known to be18 months. What is a 90% confidence interval for the population mean?
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A
9090%
confidence interval for the population mean is
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(Use ascending order. Round to two decimal places as needed.)
A test consists of 10 questions made of 5 answers with only one correct answer. To pass the test, a student must answer at least 8 questions correctly. (a) If a student guesses on each question, what is the probability that the student passes the test? (b) Find the mean and standard deviation of the number of correct answers. (c) Is it unusual for a student to pass the test by guessing? Explain.
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Chapter 9 Solutions
Statistics: Concepts and Controversies
Ch. 9 - Prob. 1CTBCh. 9 - Prob. 2CTBCh. 9 - Prob. 3CTBCh. 9 - Prob. 4CTBCh. 9 - Prob. 5CTBCh. 9 - Prob. 6CTBCh. 9 - Prob. 7CTBCh. 9 - Prob. 8ECh. 9 - Prob. 9ECh. 9 - Prob. 10E
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