Question

Question 21 In testing Ho: p1" p,-0 versus Ha: p1" p. 0, the computed value of the test statistic is z = 2 25 The P value for this two-tailed test is then Not yet answered Points out of 6.00 Flag question Question 22 Not yet answered Points out of 4.00 The two-sample t test is applicable in situations in which population distributions are both normal when population variances have unknown values, and at least one of the two sample sizes are small. Select one: Flag question True O False Question 23 Not yet answered Points out of 7.00 In testing Ho: ?05 0 versus Ha: ?D > 0, where ?'s the true mean difference in paired data consisting of 12 independent pairs, the sample mean and sample standard deviation are, respectively, 7.25 and 8.25. Which of the following statements are true?

Answer 1

(21) The null and alternative hypotheses are The test statistic is z = 2.25 This is a two-tailed test, the p-value is P-value = 2P(z > z.) (1-P(z < 2.25)) 2 (1-0.987776) → 2 → 2(0012224) 0.024449 P -value0.0244 (22) The two-sample t test is applicable in situati ons in which population di stributions are both normal when population vari ance have unknown values, and at least one of the two sample sizes are small is true, since it is one of the assumptions of the t - test