Question

The sample data below represents the number of late and on-time flights for Delta, United, and US Airways (Bureau of Transportation Statistics, March 2012). Airline Flight Delta Late 39 On Time 261 United Late 51 On Time 249 US Airways Late 56 On Time 344 a. Formulate the hypotheses for a test that will determine if the population proportion of late flights is the same for all three airlines. H0: All population proportions are equal Ha: Not all population proportions are equal b. Conduct the hypothesis test with a 0.05 level of significance. What is the p-value? Use Table 12.4. The p-value is - What is your conclusion? c. Compute the sample proportion of late flights for each airline. What is the overall proportion of late flights for the three airlines? Round your answer to three decimal places. The overall proportion of late flights for the three airlines is

          The sample data below represents the number of late and on-time flights for Delta, United, and US Airways (Bureau of Transportation Statistics, March 2012).

Airline     Flight
Delta       Late    39
            On Time 261

United      Late    51
            On Time 249

US Airways  Late    56
            On Time 344

a. Formulate the hypotheses for a test that will determine if the population proportion of late flights is the same for all three airlines.

H0: All population proportions are equal
Ha: Not all population proportions are equal

b. Conduct the hypothesis test with a 0.05 level of significance. What is the p-value? Use Table 12.4.

The p-value is - ______

What is your conclusion?

c. Compute the sample proportion of late flights for each airline. What is the overall proportion of late flights for the three airlines? Round your answer to three decimal places.

The overall proportion of late flights for the three airlines is ______

Added by Evelyn M.

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