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

3

Step-by-step explanation:

the question requires us to solve for the degree of freedom of this test.

we have this information below to answer this question

number on time = 90 95 85 60

sample size = 100 120 100 10

from this we can see that we have two rows, each row contains four piece of data, which gives us 4 columns

the formula for the degree of freedom:

df = (c-1)(r-1)

c = 4

r = 2

= 4-1 * 2-1

= 3 * 1

= 3

thank you!

to rewrite a literal equation you may need to divide by a number, or by a variable.

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