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Suppose Containers Inc. is implementing a smoke-free workplace policy and is interested in whether smoking affects worker accidents. The company completed a report of on-the-job accidents. A sample was drawn of names of workers who were involved in accidents last year. A similar sample was drawn from among workers who had not reported accidents in the last year. Members of both groups were interviewed to determine their smoking habits. The table below summarises the information: Heavy Moderate Non-smoker Total Accident 12 9 13 34 No Accident 4 6 22 32 Total 16 15 35 66 As a researcher you are asked to test whether there is a difference in the on-job accident occurrences between smokers and non-smokers. What are the hypotheses you are testing? What would be your conclusion? (Notes: the test should be conducted by using a significance level of 5%. The critical value can be found in the statistical tables at the end of this exam paper).Critical point. For example omg leaves .025 probability in the tail. TABLE V t Critical Points d.f. t.as t.as Loos ,ones 1.00 3.08 6.31 12.7 31.8 63.7 127 318 637 .82 1.89 2.92 4.30 6.96 9.92 14.1 22.3 31.6 AUNE 76 1.64 2.35 3.18 4.54 5.84 7.45 10.2 12.9 74 1.53 2.13 2.78 3.75 4.60 5.60 7.17 8.61 .73 1.48 2.02 2.57 3.36 4.03 4.77 5.89 6.87 .72 1.44 1.94 2.45 3.14 3.71 4.32 5.21 5.96 .71 1.41 1.89 2.36 3.00 3.50 4.03 4.79 5.41 .71 1.40 1.86 2.31 2.90 3.36 3.83 4.50 5.04 .70 1.38 1.83 2.26 2.82 3.25 3.69 4.30 4.78 4.14 4.59 10 .70 1.37 1.81 2.23 2.76 3.17 3.58 .70 1.36 1.80 2.20 2.72 3.11 3.50 4.02 4.44 .70 1.36 1.78 2.18 2.68 3.05 3.43 3.93 4.32 .69 1.35 2.16 2.65 3.01 3.37 3.85 4.22 .69 1.35 1.76 2.14 2.62 2.98 3.33 3.79 4.14 .69 1.34 1.75 2.13 2.60 2.95 3.29 3.73 4.07 .69 1.34 1.75 2.12 2.58 2.92 3.25 3.69 4.01 .69 1.33 1.74 2.11 2.57 2.90 3.22 3.65 3.97 1.33 1.73 3.20 3.61 3.92 .69 2.10 2.55 2.88 .69 1.33 1.73 2.09 2.54 2.86 3.17 3.58 3.88 1.33 1.72 2.09 2.53 2.85 3.15 3.55 3.85 20 .69 21 .69 1.32 1.72 2.08 2.52 2.83 3.14 3.53 3.82 22 .69 1.32 1.72 2.07 2.51 2.82 3.12 3.50 3.79 23 .69 1.32 1.71 2.07 2.50 2.81 3.10 3.48 3.77 24 .68 1.32 1.71 2.06 2.49 2.80 3.09 3.47 3.75 .68 1.32 1.71 2.06 2.49 2.79 3.08 3.45 3.73 25 26 .68 1.31 1.71 2.06 2.48 2.78 3.07 3.43 3.71 27 .68 1.31 1.70 2.05 2.47 2.77 3.06 3.42 3.69 28 1.31 1.70 2.05 2.47 2.76 3.05 3.41 3.67 .68 29 .68 1.31 1.70 2.05 2.46 2.76 3.04 3.40 3.66 30 .68 1.31 1.70 2.04 2.46 2.75 3.03 3.39 3.65 1.30 1.68 2.02 2.42 2.70 2.97 3.31 3.55 40 .68 3.46 60 .68 1.30 1.67 2.00 2.39 2.66 2.92 3.23 68 1.29 1.66 1.98 2.36 2.62 1.86 3.16 3.37 120 .67 1.28 1.64 1.96 2.33 2.58 2.81 3.09 3.29 = 235 - 210 = Zas = Zmas = Zoo = 2 00s = 20091 = 2,0010 = Zoo03