Tutorial 9 Answers.pdf

Tutorial 9 Answers.pdf - TUTORIAL 9 INFERENCE ABOUT...

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Page 1 of 4 TUTORIAL 9 INFERENCE ABOUT COMPARING TWO POPULATIONS (CHAPTER 13) TRUE/FALSE 1. Independent samples are those for which the selection process for one is not related to the selection process for the other. ANS: T 2. In testing the difference between two population means using two independent samples, the sampling distribution of the sample mean difference is normal if the sample sizes are both greater than 30. ANS: F 3. A political analyst in Iowa surveys a random sample of registered Republicans and compares the results with those obtained from a random sample of registered Democrats. This would be an example of two independent samples. ANS: T 4. Two samples of sizes 25 and 20 are independently drawn from two normal populations, where the unknown population variances are assumed to be equal. The number of degrees of freedom of the equal-variances t -test statistic is 44. ANS: F 5. The sampling distribution of is normal if the sampled populations are normal, and approximately normal if the populations are no normal and the sample sizes n 1 and n 2 are large. ANS: T 6. Both the equal-variances and unequal variances test statistic and confidence interval estimator of require that the two populations be normally distributed. ANS: T 7. The best estimator of the difference between two population means is the difference between two sample means . ANS: T 8. When we test for differences between the means of two independent populations, we can only use a two-tailed test.
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  • One '17
  • Wahid Murad

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