1 Computer Assignment 2 Psychology 541 Advanced Univariate Statistics Fall 2016 sec 02 20 points-TURN ALL ANSWERS NEED TO BE TYPED This assignment is due on Saturday 10/15/16 in Blackboard by 11:00 AM. 1. A political candidate wishes to determine if endorsing increased social spending is likely to affect her standing in the polls. She has access to data on the popularity of several other candidates who have endorsed increased spending. The data was available both before and after the candidates announced their positions on the issue. The data are as follows: Candidate Popularity Ratings 1 Before 42 2 41 45 3 50 56 4 52 54 5 58 65 6 32 29 7 39 46 8 42 48 9 48 10 47 After 43 ':'- 47 53 Assuming no other factors were influencing the popularity ratings a. State the nondirectional alternative hypothesis. b. State the null hypothesis. c. What is the value of t obtained. d. What is the value of t critical. d. What might the candidate conclude using = 0.012 tail? 2 e. What type error might the candidate have made? f. calculate cohen's d use SD for popularity before. 4. A nurse was hired by a governmental ecology agency to investigate the impact of a lead smelter on the level of lead in the blood of children living near the smelter. Ten children were chosen at random from those living near the smelter. A comparison group of seven children was randomly selected from those living in an area relatively free from possible lead pollution. Blood samples were taken from the children and lead levels determined. The following are the results (scores are in micrograms of lead per 100 milliliters of blood. Lead Levels Children living near smelter Children living in unpolluted area 18 9 16 13 21 8 14 15 17 17 19 12 22 11 24 15 18 a. What is the alternative hypothesis? Assume that a directional hypothesis is warranted. b. What is the null hypothesis? c. What is the value of t obtained. d. What is the value of t-critical. d. What might the candidate conclude using = 0.05 2 tail? e. What type error might the candidate have made? f. Estimate the size of the real effect using omega squared and cohen's d. Is the effect a large one