lOMoARcPSD105219 5 Q1c please calculate the appropriate test statistic 5 points

Lomoarcpsd105219 5 q1c please calculate the

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lOMoARcPSD|105219
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Q1c: please calculate the appropriate test statistic. (5 points) Observed frequencies A B C Total i Students 200 50 50 300 Non-students 80 40 80 200 Total j 280 90 130 500 1 200 168 43 6.0952 2 50 54 -4 0.2963 (A: 0.851) 3 50 78 -28 10.0513 4 80 112 -32 9.1429 5 40 36 4 0.4444 6 80 52 28 15.0769 Total: 41.107 ( Answer sheet says 41.6626) Q1d: Determine the appropriate degrees of freedom. (1 point) Q1e: Is there enough evidence to conclude that types of smartphones are associated to customers’ occupations? Please explain why you make this conclusion. Use a 5% significance level. (3 points) Expected frequencies A B C Students 500*(280/500)*(300/50 0)=168 500*(90/500)*(300/500)= 54 500*(130/500)*(300/500)= 78 Non-students 500*(280/500)*(200/50 0)=112 500*(90/500)*(200/500)= 36 500*(130/500)*(200/500)= 52 lOMoARcPSD|105219
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Q1f: Which test is statistically correct to investigate whether the preferences between students and non-students are different? Please also briefly explain why you choose this test. (3 points) Q1g: What is the null and alternative hypothesis the manufacturer wants to test? (2 points) Students Rank Non-students Rank 2 9 1 1 3.5 4 1 3.5 3 12.5 4 15 1 2 9 3 12.5 1 3.5 2 2 9 2 1 3.5 4 T1=56 T2=80 Q1i: Is there enough evidence to conclude that the preferences of students and non-students are different? Please explain why you make this conclusion. Use a 5% significance level. (3 points) 3.5 15 3.5 9 9 15 =87
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