Question

(11-13] The information below is based on independent simple random samples taken from two normally distributed populations having equal variances. Based on the sample information, answer the following questions about the difference between two population means. ni = 13 n2 = 12 X 1 = 51 i , = 58 S = 6 S2 = 5 11) (1 point) The parameter of interest could be: a. X1-X2 b. H1-42 C. P1-P2 d. Other, please specify: 12) (1 point) Your friend started working on a 95% confidence interval, but she was not sure what the critical value is. Which one is a suitable process? a. invT(.95, 12-1+12-1) b. inve(.95, 23). C. invT6.975, 12-1+12-1) d. Other, please specify: 13) (1 point) Another one of your friends was working on the pooled standard deviation. She was starting out with this, but was not sure if she was right: (13 – 1)62 + (12 - 1972 V12 -1 + 12-1 a. Looks good b. The denominator should have 23 in it, not 22 C. (13-1) and (12-1) should both be squared d. Other, please specify: [14-15] You were looking at some data in a journal article, which is below, selected as simple random samples from two populations: Sample 2 n2 = 50 x2 = 35 Sample 1 n = 150 x = 60 14) (1 point) The article was testing this null hypothesis: Ho:P1 – P2 = 0 What tailed test does this involve? a. Left Tailed b. Two Tailed C. Right Tailed d. No Tailed 15) (1 point) If the p-value in the study was greater than the significance level, what would be the decision? a. Reject the null hypothesis b. Accept the null hypothesis c. Fail to reject the null hypothesis. d. Neither reject nor fail to reject the null hypothesis

Answer 1

11)

b. $\mu _{1}-\mu _{2}$

12)

b.invT(.95,23)

13)

b) The denominator should have 23 in it not 22

14)

b.Two tailed

15.

d. Neither reject nor fail to reject the null hypothesis