30.6% 6. In testing the difference between two population means using two indepe

Question

30.6% 6. In testing the difference between two population means using two independent samples, we use the pooled variance in estimating the standard crror of the sampling distrbution of the sample mean difference A. sizes are both greater than 30 B. ample sizes are both large C. populations are at least normally distributed with equal variances D. populations ate noanormal with unequal variances. 7. In testing the difference between two population means using two independent samples, the sampling distribution of the sample mean diference r2n A. populations are normal B. population sizes are both preater than 30 C. sizes ae both greater than 30 D. populations are pcenormal and the sample sizes ae large is normal if the 8. In testing for the equality of two population variances, when the populations are normally distributed t 10% level of significance has been used To determine the rejection region, it will be necessary to refer to the F table corresponding to an upper-tail area of A. 0.20 B. 0.05 C. 0.10 D. 090 9. The vertical dastances between observed and predicted values of y are called A. scatterplots B. least square lises C. errors of prediction D methods of least squares 's 095. For df= 10, the table value equals 10. A left-tal area in the chi-square distribution er, A. 15.987 B. 18.307 C. 3 940 D. 20.483 11. In testing a population variance or constructing a confidence interval for the population variance, an essential assumption is that A. sample size exceeds B. the population is uneformly distnbuted C. the populato is cormally distnbuted D. expected frequencies equal or exceed S F12 Clear F1 F10 F9 Backspace 8 Home P Up pgDn 5 End

Explanation / Answer

6 ) C ) Populations are atleast normally distributed with equal variances .

The correct option is ( C ) .

7 ) A ) Populations are normal .

The correct option is ( A ) .

8 ) C ) 0.10

The correct option is ( C ) .

9 ) C ) Errors of prediction .

The correct option ( C ) .

10 ) C ) 3.940

The correct option is ( C ) .

11 ) C ) The population is normally distributed

The correct option is ( C ) .

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