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Mathematics, 02.04.2021 02:40 honeylebling
The Department of Transportation would like to investigate if a difference exists in the proportion of flights that arrive on-time between Alaska Airlines, Delta Airlines, Southwest Airlines, and United Airlines. The following data represent the number of on-time flights from random samples taken from each airline. Alaska Delta Southwest United Number on Time 90 95 85 60 Sample Size 100 120 100 80 The degrees of freedom for the chi-square critical value is
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