How should data be collected for a chi-square test?
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What method of data collection was used in the following study? “At a large church sponsored university 329 students were surveyed by phone using an SRS and asked their class standing and whether they thought kissing on a first data was appropriate.”
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What method of data collection was used in the following study? “Newly laid Python eggs were randomly assigned to one of three temperatures; at the end of the study eggs were classified as either ‘hatched’ or ‘didn’t hatch’.”
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What method of data collection was used in the following study? “Random samples were taken from three different countries—the United States, India and France. Each respondent was asked whether they think it is wrong to have a baby if ther are not married.”
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In addition to proper data collection, what other condition is required for the P-value from a chi-square test to be trusted?
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How many treatments will be compared in this study?
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True or false: If the response variable had been quantitative rather than categorical, then a chi-square test should not have been used to analyze the data from this study.
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What null hypothesis will test the equality of the proportions of relapse for the three treatments?
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Why were the patients randomly allocated to the treatments?
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Assuming that the null hypothesis is true, how many patients do we expect to relapse taking lithium?
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Are the expected counts large enough so that the chi-square test statistic has an approximate chi-square distribution?
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What is the contribution to the chi-square test statistic for the placebo/relapse cell?
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What are the degrees of freedom for this chi-square test?
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With P-value = 0.0052 and α = 0.02, can we reject the null hypothesis?
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For this study, can we conclude that the type of treatment causes a difference in the relapse rates?
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Which cell is the largest contributor to the chi-square test statistic?
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What treatment would you recommend for a patient who wants to break their cocaine habit?
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