Q1. An anthropologist wants to collect data to determine whether the two different cultural groups that occupy an isolated Pacific Island grow to be different heights. The results of his samples of the heights of adult females are as follows Group A n = 120 Group B n = 150 X= 62.7 = 61.8 S1= 2.5 S2 = 2.62 Do these samples constitute enough evidence to reject the null hypothesis that the heights of the two groups are the same? Set alpha to .05. 1. What are the appropriate null and alternative hypothesis? A. Ho: Hi – Hz# 0_H;:H1 – Hz = 0 B. Ho: H1 – H2 >0 H;:µ1 – Hz < 0 C. Ho: Hi – Hz <0 H;: H1 – H2 > 0 D. Ho: H1 – H2 = 0 H;: H1 - H2 # 0 E. None of these. 2. What is the Test statistics? A. Z = ž-y-Do B. Z = x-y-Do С. Т %3 X-y-Do D.T = D-Do E. T = x-y-Do 1 1 Spn1 n2 SD n1 n2 n1 n2 n1 n2 3. What is the value of the test statistic? A. T = 2.82 B.T = 9.20 C.Z = 9.20 D.T = 1.44 E.None of these 4. For a significance level of 0.05, what is the critical value? A. Z0.05 = 1.645 B.to.025 = 1.960 C.to.05 = 1.645 D.zo.025 = 1.960 E.None of these 5. What is the appropriate decision and conclusion? A. Reject Ho, so no significance evidence to conclude heights of the two groups are different. B. Fail to eject Ho, so no significance evidence to conclude heights of the two groups are different. C. Fail to reject Ho, so there significance evidence to conclude: heights of the two groups are different D. Reject Ho, so there is significance evidence to conclude heights of the two groups are different.

Q1-5: Given the following data from a sample of sizen= 7 12 7 49073 The third qoartile is: Select one: O a. 4 O b. 7 O c. 8 O d. 9

Children with autism differ significantly from children without autism on tests of varbal ability.   repeated measures? or ind. with two tails?

3.  Can SAT scores predict college performance?  Let x be a variable that represents SAT score of a computer science major, and let y be a variable that represents a student’s GPA upon graduation.  A random sample of n =15 computer science majors provided their SAT scores and GPAs: x 1232 1070 1086 1287 1130 1048 1121 1095 1135 1208 1333 1160 1186 1243 1261 y 3.52 2.91 2.4 3.47 3.47 2.37 2.4 2.24 3.02 3.32 3.59 2.54 3.19 3.71 3.58   The scatter diagram for the SAT score and GPA is given below:   (a)  Find the sample correlation coefficient r.  Truncate to two decimal places.  What does the value tell you about the data? (b)  Find the equation of the least squares line .  Truncate to four decimal places.  What does the slope mean? (c)  Find the value of the coefficient of determination .  Truncate to two decimal places.  What does this number mean? (d)  What is the predicted GPA if a computer science major got a…