Do # 1-7,9,10 in the REVIEW EXERCISES of Ch08. Decide whether each of the following statements is true or false. If a statement is false, explain why.

Decide whether each of the following statements is true or false. If a statement is false, explain why. 8.1. The r distribution is appropriate for small sample sizes irrespective of whether or not the variance is known. 8.2. For each positive-integer degree of freedom, there is a different I distribution. 8.3. Gosset discovered that when n is small 32 tends to overestimate 02. 8.4. For a one-sample rtest, the region of rejection is uniquely determined by the alternative hypothesis and sample size. 8.5. For a xed or level, as the degrees of freedom increase in a t test, the absolute value of the critical value increases. 8.6. Class: )7 i 1303253,! contains 95% of all population means. 8.7. 5) -|_ rayzivs/N/rr is narrower than the corresponding interval based on the standard normal distribution 51 -|_- zas/ . 8.9. In the matched-pair t test, the parameter in the null hypothesis must equal zero. 8.10. In a paired comparison 1: test involving 20 pairs of twins, there are 38 degrees of freedom