EBK ELEMENTARY STATISTICS USING EXCEL
7th Edition
ISBN: 9780136937401
Author: Triola
Publisher: VST
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Chapter 7.4, Problem 18BSC
To determine
Find the 99% confidence interval of
Compare this result with that in Exercise 23 of Section 7-2.
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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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Part 1
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.
In a group of 40 people, 35% have never been abroad. Two people are selected at random without replacement and are asked about their past travel experience. a. Is this a binomial experiment? Why or why not? What is the probability that in a random sample of 2, no one has been abroad? b. What is the probability that in a random sample of 2, at least one has been abroad?
Chapter 7 Solutions
EBK ELEMENTARY STATISTICS USING EXCEL
Ch. 7.1 - Prob. 1BSCCh. 7.1 - Prob. 2BSCCh. 7.1 - 3. Notation For the poll described in Exercise 1,...Ch. 7.1 - 4. Confidence Levels Given specific sample data,...Ch. 7.1 - Prob. 5BSCCh. 7.1 - Prob. 6BSCCh. 7.1 - Prob. 7BSCCh. 7.1 - Prob. 8BSCCh. 7.1 - Prob. 9BSCCh. 7.1 - Prob. 10BSC
Ch. 7.1 - Prob. 11BSCCh. 7.1 - Prob. 12BSCCh. 7.1 - Prob. 13BSCCh. 7.1 - Prob. 14BSCCh. 7.1 - Prob. 15BSCCh. 7.1 - Prob. 16BSCCh. 7.1 - Critical Thinking. In Exercises 17–28, use the...Ch. 7.1 - Prob. 18BSCCh. 7.1 - Prob. 19BSCCh. 7.1 - Critical Thinking. In Exercises 17–28, use the...Ch. 7.1 - 21. Touch Therapy When she was 9 years of age,...Ch. 7.1 - Prob. 22BSCCh. 7.1 - Prob. 23BSCCh. 7.1 - Prob. 24BSCCh. 7.1 - Prob. 25BSCCh. 7.1 - Prob. 26BSCCh. 7.1 - Prob. 27BSCCh. 7.1 - Prob. 28BSCCh. 7.1 - Using Appendix B Data Sets. In Exercises 29 and...Ch. 7.1 - Prob. 30BSCCh. 7.1 - Prob. 31BSCCh. 7.1 - Prob. 32BSCCh. 7.1 - Prob. 33BSCCh. 7.1 - Determining Sample Size. In Exercises 31–38, use...Ch. 7.1 - Prob. 35BSCCh. 7.1 - Prob. 36BSCCh. 7.1 - Prob. 37BSCCh. 7.1 - Prob. 38BSCCh. 7.1 - Prob. 39BBCh. 7.1 - Prob. 40BBCh. 7.1 - Prob. 41BBCh. 7.2 - Prob. 1BSCCh. 7.2 - Statistical Literacy and Critical Thinking
In...Ch. 7.2 - Prob. 3BSCCh. 7.2 - Prob. 4BSCCh. 7.2 - Prob. 5BSCCh. 7.2 - Prob. 6BSCCh. 7.2 - Prob. 7BSCCh. 7.2 - Prob. 8BSCCh. 7.2 - Prob. 9BSCCh. 7.2 - Prob. 10BSCCh. 7.2 - Prob. 11BSCCh. 7.2 - Prob. 12BSCCh. 7.2 - Prob. 13BSCCh. 7.2 - Prob. 14BSCCh. 7.2 - Prob. 15BSCCh. 7.2 - Prob. 16BSCCh. 7.2 - Prob. 17BSCCh. 7.2 - Prob. 18BSCCh. 7.2 - Prob. 19BSCCh. 7.2 - Confidence Intervals. In Exercises 9–24, construct...Ch. 7.2 - Prob. 21BSCCh. 7.2 - Prob. 22BSCCh. 7.2 - Prob. 23BSCCh. 7.2 - Prob. 24BSCCh. 7.2 - Prob. 25BSCCh. 7.2 - Prob. 26BSCCh. 7.2 - Prob. 27BSCCh. 7.2 - Prob. 28BSCCh. 7.2 - Prob. 29BSCCh. 7.2 - Prob. 30BSCCh. 7.2 - Prob. 31BSCCh. 7.2 - Prob. 32BSCCh. 7.2 - Prob. 33BBCh. 7.2 - Prob. 34BBCh. 7.3 - Prob. 1BSCCh. 7.3 - Prob. 2BSCCh. 7.3 - Prob. 3BSCCh. 7.3 - Prob. 4BSCCh. 7.3 - Prob. 5BSCCh. 7.3 - Prob. 6BSCCh. 7.3 - Prob. 7BSCCh. 7.3 - Prob. 8BSCCh. 7.3 - Prob. 9BSCCh. 7.3 - Finding Confidence Intervals. In Exercises 9–16,...Ch. 7.3 - Prob. 11BSCCh. 7.3 - Prob. 12BSCCh. 7.3 - Prob. 13BSCCh. 7.3 - Prob. 14BSCCh. 7.3 - Prob. 15BSCCh. 7.3 - 16. Comparing Waiting Lines
a. The values listed...Ch. 7.3 - Prob. 17BSCCh. 7.3 - Prob. 18BSCCh. 7.3 - Prob. 19BSCCh. 7.3 - Prob. 20BSCCh. 7.3 - Prob. 23BBCh. 7.3 - Prob. 24BBCh. 7.4 - Prob. 3BSCCh. 7.4 - Prob. 5BSCCh. 7.4 - Prob. 6BSCCh. 7.4 - Prob. 7BSCCh. 7.4 - Prob. 8BSCCh. 7.4 - Prob. 9BSCCh. 7.4 - Prob. 10BSCCh. 7.4 - Prob. 18BSCCh. 7 - Prob. 2CQQCh. 7 - Prob. 3CQQCh. 7 - 4. Loose Change USA Today reported that 40% of...Ch. 7 - 5. Sample Size for Proportion Find the sample size...Ch. 7 - Prob. 7CQQCh. 7 - Prob. 8CQQCh. 7 - Prob. 9CQQCh. 7 - Prob. 10CQQCh. 7 - Prob. 1CRECh. 7 - Prob. 3CRECh. 7 - Prob. 1EP
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