Which of the following is a statistically significant findin

Which of the following is a statistically significant finding (i.e., the null hypothesis is rejected) for a two independent samples t test when N = 20?

a. 95% confidence interval = 4.50, 9.50

b. t = 1.80

c. p > .05

d. all these answers are correct

Solution

b. t = 1.80 is a statistically significant finding (i.e., the null hypothesis is rejected) for a two independent samples t test when N = 20 as t(18,0.05)=1.734. Thus, the test statistic falls in the critical region. So, reject the null hypothesis.