Test for Homogeneity.pdf - Test for Homogeneity A public opinion poll surveyed a simple random sample of 500 voters in Oregon The respondents were asked

# Test for Homogeneity.pdf - Test for Homogeneity A public...

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Test for Homogeneity A public opinion poll surveyed a simple random sample of 500 voters in Oregon. The respondents were asked which political party they identified with most and were categorized by residence. Results are shown below. Decide if voting preference is independent from location of residence. Let α=0.05. Republican Democrat Independent NW Oregon 72 104 24 SW Oregon 31 59 10 Central Oregon 42 47 11 Eastern Oregon 59 33 8 Hypotheses: Voting preference is independent of location of residence. Voting preference is dependent on location of residence. Enter the test statistic - round to 4 decimal places. 20.4552 Enter the P -Value - round to 4 decimal places. 0.0023 Can it be concluded that voting preference is dependent on location of residence? Yes A manufacturing company knows that their machines produce parts that are defective on occasion. They have 4 machines producing parts, and want to test if defective parts are dependent on the machine that produced it. They take a random sample of 300 parts and find the following results. Test at the 0.05 level of significance.
Machine 1 Machine 2 Machine 3 Machine 4 Defective 9 12 15 6 Non-Defective 63 70 68 57 Hypotheses: Number of defective parts is independent of machine. Number of defective parts is dependent on machine. Enter the test statistic - round to 4 decimal places. 2.3536 Enter the P -Value - round to 4 decimal places. 0.5023 Can it be concluded that number of defective parts is dependent on machine? No A restaurant chain that has 3 locations in Portland is trying to determine which of their 3 locations they should keep open on New Year’s Eve. They survey a random sample of customers at each location and ask each whether or not they plan on going out to eat on New Year’s Eve. The results are below.

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