1-20chapter stats

She selected a random sample of 60 male and 60 female

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Unformatted text preview: l survey in the two cities looking at the price of midrange homes. Assume equal population variances. Calculate the 95% confidence interval where pooled variance = 4335357.143 A. (649.24 5150.76) B. (-1566.21 7366.21) C. (675.46 5124.54) D. (-766.67 6566.67) 1-858 Chapter 01 - An Introduction to Business Statistics Chapter 10 Statistical Inferences Based on Two Samples Answer Key True / False Questions 1. An independent samples experiment is an experiment in which there is no relationship between the measurements in the different samples. TRUE AACSB: Reflective Thinking Bloom's: Knowledge Difficulty: Medium Learning Objective: 1 Topic: Independent samples 2. When testing the difference between two proportions selected from populations with large independent samples, the Z test statistic is used. TRUE AACSB: Reflective Thinking Bloom's: Knowledge Difficulty: Medium Learning Objective: 5 Topic: Two independent population proportions 1-859 Chapter 01 - An Introduction to Business Statistics 3. In forming a confidence interval for , only two assumptions are required: independent samples and sample sizes of at least 30. FALSE AACSB: Reflective Thinking Bloom's: Knowledge Difficulty: Medium Learning Objective: 1 Topic: Two independent population means 4. In testing the equality of population variances, two assumptions are required: independent samples and normally distributed populations. TRUE AACSB: Reflective Thinking Bloom's: Knowledge Difficulty: Medium Learning Objective: 7 Topic: Two population variances 5. In an experiment involving matched pairs, a sample of 12 pairs of observations is collected. The degree of freedom for the t statistic is 10. FALSE AACSB: Reflective Thinking Bloom's: Application Difficulty: Medium Learning Objective: 4 Topic: Paired differences 1-860 Chapter 01 - An Introduction to Business Statistics 6. When comparing two independent population means, if n1 = 13 and n2 = 10, degrees of freedom for the t statistic is 22. FALSE AACSB: Reflective Thinking Bloom's: Application Difficulty: Easy Learning Objective: 2 Topic: Two independent population means 7. When comparing the variances of two normally distributed populations using independent random samples, if TRUE , the calculated value of F will always be equal to one. AACSB: Reflective Thinking Bloom's: Knowledge Difficulty: Easy Learning Objective: 7 Topic: Two population variances 8. In testing the difference between two population variances, it is a common practice to compute the F statistic so that its value is always greater than or equal to one. TRUE AACSB: Reflective Thinking Bloom's: Comprehension Difficulty: Medium Learning Objective: 7 Topic: Two population variances 9. The F statistic can assume either a positive or a negative value. FALSE AACSB: Reflective Thinking Bloom's: Knowledge Difficulty: Easy Learning Objective: 6 Topic: Two population variances 1-861 Chapter 01 - An Introduction to Business Statistics 10. There are two types of machines called type A and type B. Both type A and type B can be used to produce a certain product. The production manager wants to compare efficiency of the two machines. He assigns each of the fifteen workers to both types of machines to compare the hourly production rate of the 15 workers. In other words, each worker operates machine A and machine B for one hour each. These two samples are independent. FALSE AACSB: Reflective Thinking Bloom's: Analysis Difficulty: Medium Learning Objective: 3 Topic: Two independent population means 11. In testing the difference between two means from two independent populations, the sample sizes do not have to be equal to be able to use the Z statistic. TRUE AACSB: Reflective Thinking Bloom's: Comprehension Difficulty: Medium Learning Objective: 1 Topic: Two independent population means 12. In testing the difference between the means of two normally distributed populations using large independent random samples, the sample sizes from the two populations must be equal in order to use a Z statistic. FALSE AACSB: Reflective Thinking Bloom's: Comprehension Difficulty: Easy Learning Objective: 1 Topic: Two independent population means 1-862 Chapter 01 - An Introduction to Business Statistics 13. In testing the difference between the means of two normally distributed populations using large independent random samples, the alternative hypothesis indicates no differences between the two specified means. FALSE AACSB: Reflective Thinking Bloom's: Comprehension Difficulty: Easy Learning Objective: 1 Topic: Two independent population means 14. In testing the difference between the means of two normally distributed populations using large independent random samples, we can only use a two-sided test. FALSE AACSB: Reflective Thinking Bloom's: Knowledge Difficulty: Easy Learning Objective: 1 Topic: Two independent population means 15. In testing the difference between the means of two independent populations, if neither population is normally distributed, then the sampling distribution of the difference in means will be approximately normal provided that the sum of the sample sizes obtained from the two popul...
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