Blog

————————————————————————————————————————————- Week 3 Assignment 1.         Using StatCrunch, calculate the chi-square statistic and degrees of freedom for the following set of data for 300 people: Had flu shot                     20                   30                    32                   82 Didn’t have flu shot         80                   70                    68                 218 Total                               100                 100                  100                 300 Is the value of the chi-square statistically significant at the 0.05 level? 2.         Write a paragraph summarizing the results of the analysis in Exercise 1. 3.         Using StatCrunch, calculate the chi-square statistic and degrees of freedom for the following set of data for 180 people undergoing a knee replacement treatment with a drug supplement: Had > 8 wk rehab                   18                                32                                  50 Had < 8 wk rehab                   70                                60                                  130 Total                88                                92                                 180 Is the value of the chi-square statistically significant at the 0.05 level? 4.         Write a paragraph summarizing the results of the analysis in Exercise 3. 5.         Given each of the following circumstances, determine whether the calculated values of chi-square are statistically significant: a. ? = 3.02, = 1, ? = 0.05 b. ? = 8.09, = 4, ? = 0.05 c. ? = 10.67, = 3, ? = 0.01 d. ? = 9.88, = 2

, ? = 0.01 6.         Match each of the nonparametric tests in Column A with its parametric counterpart in Column B A. Nonparametric Test                        B.  Parametric Test 1.  Mann-Whitney -test                    a.  Paired -test 2.  Friedman test                                 b.  One-way ANOVA 3.  Kruskall-Wallis test                        c.  Independent groups -test 4.  Wilcoxon signed-ranks test            d.  Repeated measures ANOVA 7.   Using the information provided, indicate which statistical test you think should be used for each of the following situations: a. Independent variable: normal birth weight vs. low birth weight infants; dependent variable: 1 minute Apgar scores (1-10 scale). b. Independent variable: time of measurement (before, during, and after surgery); dependent variable: heart rate. c. Independent variable: time of measurement (before, during, and after intervention); dependent variable: did vs did not exercise regularly. d. Independent variable: infertility treatment A vs infertility treatment B vs control condition; dependent variable: did vs did not become pregnant. 8.         Below are three sets of frequencies for the four cells of contingency tables.  Identify which statistical procedure would be appropriate for each, using the most conservative approach. a.         4        4                        b.         35          35                  c.         9         9 21    21                                    65          65                            91       91 Purchase the answer to view it Purchase the answer to view it Purchase the answer to view it Purchase the answer to view it Purchase the answer to view it Purchase the answer to view it Purchase the answer to view it Purchase the answer to view it