Author Question: A statistics class at Wilmington College has 25 students of which 15 are math majors and 10 are ... (Read 70 times)

TVarnum · **on:** Jun 24, 2018

A statistics class at Wilmington College has 25 students of which 15 are math majors and 10 are business majors. The professor randomly selects five students to work together on a group project.

What is the standard deviation of this probability distribution if selecting a business major is defined as a success?A) 0.255
B) 0.850
C) 1.000
D) 1.507

Question 2

Expedia would like to test the hypothesis that the average roundtrip airfare between Philadelphia and Paris is higher for a flight originating in Philadelphia when compared to a flight originating in Paris.

The following data summarizes the sample statistics for roundtrip flights originating in both cities. Assume that the population variances are equal. Originating City Philadelphia ParisSample mean 1,240 1,060Sample size 15 19Sample standard deviation 270 240If Population 1 is defined as flights originating in Philadelphia and Population 2 is defined as flights originating in Paris, which one of the following statements is true?A) Because the 90 confidence interval includes zero, Expedia cannot conclude that the average roundtrip airfare between Philadelphia and Paris is higher for a flight originating in Philadelphia when compared to a flight originating in Paris.
B) Because the 90 confidence interval does not include zero, Expedia cannot conclude that the average roundtrip airfare between Philadelphia and Paris is higher for a flight originating in Philadelphia when compared to a flight originating in Paris.
C) Because the 90 confidence interval includes 0, Expedia can conclude that the average roundtrip airfare between Philadelphia and Paris is higher for a flight originating in Philadelphia when compared to a flight originating in Paris.
D) Because the 90 confidence interval does not include 0, Expedia can conclude that the average roundtrip airfare between Philadelphia and Paris is higher for a flight originating in Philadelphia when compared to a flight originating in Paris.

marict · **Reply #1 on:** Jun 24, 2018

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