Statistics The Exploration & Analysis Of Data 7th Edition By Roxy Peck – Test Bank
Chapter 11: Comparing Two Populations or Treatments
The following questions are in a True / False format. The answers to these questions will frequently depend on remembering facts, understanding of the concepts, and knowing the statistical vocabulary. Before answering these questions, be sure to read them carefully!
T F 1. Two samples are said to be independent when the selection of the individuals in one sample has no bearing on the selection of those in the other sample.
T F 2. is an unbiased statistic used to estimate .
3. For two independent samples, .
T F 4. For both large and small samples the estimated standard deviation of is calculated the same way.
T F 5. The large sample z test for can be used as long as at least one of the two sample sizes, , is greater than or equal to 30.
T F 6. The P-value of an upper-tail t test is the area to the right of the calculated t value under the appropriate t curve.
T F 7. The number of degrees of freedom of the two-sample t test are the same as the degrees of freedom for the paired t test statistic.
T F 8. The number of degrees of freedom used in the two-sample t test for independent samples are the same as the degrees of freedom used in the construction of a confidence interval for .
T F 9. and are always equal.
T F 10. is a biased estimator of .
T F 11. The standard deviation of used in the large sample hypothesis test of is the same as the standard deviation used in the large sample confidence interval for .
Chapter 11, Concept Quiz Answer Key