Question

# 1. When the test statistic is t and the number of degrees of freedom is greater than 30, the critical value of t is very close to that of the

standard normal critical value. 2. If the calculated value of the z statistic is negative, then there is strong evidence that the null hypothesis is false. 3. To calculate a pooled variance for more than two independent samples, the samples must be of equal size. 4. If a null hypothesis is rejected at the 0.01 level of significance, it will also be rejected at the 0.05 level of significance. 5. One of the assumptions underlying the use of the (pooled) two-sample test is that the samples are drawn from populations having equal means. 6. In ANOVA, the variances of multiple populations are analyzed in order to determine the relationship between their population means. F7.If the test statistic falls in the rejection region, the null hypothesis is proven to be true. 8. A two-sample test is twice as powerful as a one-sample test. 9. The sampling distribution of a proportion is approximated by the Chi-square distribution. 10. The null hypothesis of a t test will be rejected if the test statistic is greater than the critical value at significance level, a.

Fig: 1

Fig: 2

Fig: 3

Fig: 4

Fig: 5

Fig: 6

Fig: 7

Fig: 8

Fig: 9

Fig: 10