BSTAT2 2nd Edition By Gerald Keller – Test Bank

Test Bank For BSTAT2 2nd Edition By Gerald Keller

CHAPTER 11: INFERENCE ABOUT A POPULATION

TRUE/FALSE

1. With a purpose to decide the p-worth related to speculation testing in regards to the inhabitants imply , it’s essential to know the worth of the take a look at statistic.

ANS: T NAT: Analytic; Speculation Testing

2. With a purpose to interpret the p-worth related to speculation testing in regards to the inhabitants imply , it’s essential to know the worth of the take a look at statistic.

ANS: F NAT: Analytic; Speculation Testing

3. If a pattern has 15 observations and a 95% confidence estimate for  is required, the suitable worth of t is 1.753.

ANS: F NAT: Analytic; Speculation Testing

4. If a pattern has 18 observations and a 90% confidence estimate for  is required, the suitable worth of t is 1.740.

ANS: T NAT: Analytic; Speculation Testing

5. The statistic when the sampled inhabitants is regular is Scholar t-distributed with n levels of freedom.

ANS: F NAT: Analytic; Speculation Testing

6. If the sampled inhabitants is nonnormal, the t-take a look at of the inhabitants imply  remains to be legitimate, offered that the situation isn’t excessive.

ANS: T NAT: Analytic; Speculation Testing

7. A race automobile driver examined his automobile for time from 0 to 60 mph, and in 20 exams obtained a median of 48.5 seconds with an ordinary deviation of 1.47 seconds. A 95% confidence interval for the 0 to 60 time is 45.2 seconds to 51.8 seconds.

ANS: F NAT: Analytic; Speculation Testing

8. In forming a 95% confidence interval for a inhabitants imply from a pattern measurement of 20, the variety of levels of freedom from the t-distribution equals 20.

ANS: F NAT: Analytic; Speculation Testing

9. The t-distribution is utilized in a confidence interval for a imply when the precise customary error isn’t recognized.

ANS: T NAT: Analytic; Speculation Testing

10. The t-distribution permits the calculation of confidence intervals for means for small samples when the inhabitants variance isn’t recognized, whatever the form of the distribution within the inhabitants.

ANS: F NAT: Analytic; Speculation Testing

11. The t-distribution is used to develop a confidence interval estimate of the inhabitants imply when the inhabitants customary deviation is unknown.

ANS: T NAT: Analytic; Speculation Testing

12. The t-distribution assumes that the inhabitants is often distributed.

ANS: T NAT: Analytic; Speculation Testing

13. In estimating the inhabitants imply with the inhabitants customary deviation unknown, if the pattern measurement is 16, there are 8 levels of freedom.

ANS: F NAT: Analytic; Speculation Testing