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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) 1858 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 1859 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 1860 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 1861 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 1862 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 twosided 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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 Winter '14

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