Ch. 28 Chi-square test Used when the data are frequencies (counts) or proportions for 2 or more groups. Example 1 5. Calculate ((observed-expected)^2) expected 6. Calculate Chi-square = sum of the values from step 5. The degrees of freedom =
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6. Calculate Chi-square = sum of the values from step 5. The degrees of freedom =
(# rows - 1)x(# columns – 1). Find the p-value using the Chi-square table.
Activity: Titanic survival data
Use the bootstrap method to estimate the proportions in the box based on the observed data.
Null hypothesis: The proportion of “yes” in every class is the same as the overall proportion = 38%.