Answer Happy

Study Results Grup 1 Group 2 Group 3 0 Did Not Quit 61 64 62 Quit 18 17 14

(a) What type of experimental design was used in this study? OA. A completely randomized design with two levels of treatment OB A completely randomized design with three levels of treatment OC. A matched pairs design with two levels of treatment OD. This is an observational study, not a designed experiment () Rotoarchers wanted to know whether electronic cigarettes may be used to help individuals abstan torn cigarette smoking. What is the repome varinbio? Le it qualitative on quantitative The response variable (c) To what population do the results of this study apply? Cg Smokers Current smokers Smokers in the study Former smokers

(d) State the null and alternative hypotheses 5 O A. Ho Oz Ej and O2 = Ez and O3 =E3 Hy 0, *E, or 0Ex or Og #Ey OB. Ho: P2 = P2P Hy At least one of the proportions is different from the others 05 11 Ос. Но р ара ара HP *P2 *P3 OD. Ho Quitting and group are independent Hy Quitting and group are dependent (e) Does the evidence suggest e-cigs are effective in helping individuals abstain from Bogarette smokino? Use a 0.01 Compute the value of the chi-square test statistio OS 11x3 - (Round to two decimal places as needed) 05: Identify the critical value 11 x=(Round to three decimal places as needed 05 11 05 11

Does the evidence suggest o-cigs are effective? OA. The test statistic is greater than the critical value, so do not reject Ho. There is sufficient evidence that the proportions are different OB. The test statistic is greater than the critical value, so reject Ho There is sufficient evidence that the proportions are different OC Thu tost statistic in less than the critical valuo, so do not reject Ho. There is not sufficient evidence that the proportions are different OD. The test statistic is less than the critical value, so reject Ho. There is not sufficient evidence that the proportions are different () Draw a conditional bat graph by group Explain what the graph suggests Which bar graph shows the conditional distribution? a OA OBA Encacy of e-Cigs Ellicacy of e-cos Did Not Out HO Guana . 10 08 66 Group 1 Group 2 Group 60 Guar LLL 20- 02- Out Group Group 2 Did Not Out Group OC OD Elicacy of e-cigs emcacy of e-Cigs Did Not Qut IO 00 DE a a 30 60 30 20 Group 1 Group 2 Group 3 oota LLL 00- Group Group 2 Group Od Not Out Ou

from group 1 to group 3 11 The graph suggests that the proportion of the smokers who quit tend to 05 11. (a) Write a conclusion for this hypothesis test sufficient evidence to conclude that 11 05 Thore