Answered: Detroit Metro Airport (DTW) claims that…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.6: Summarizing Categorical Data

Problem 23PPS

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Question

Detroit Metro Airport (DTW) claims that between August 2015 and August 2016, inclusively, 85.5% of all tracked flights departed the airport on time (with less than 15 minutes delay). With a decrease in the number of daily flights, a news reporter begins to analyze data from 2020.

1. The reporter reasons that because there were fewer daily flights in 2020, Detroit Metro Airport's efficiency should have increased. What are the hypotheses to be tested? State the hypotheses as a sentence (no symbols). You'll want to define both H₀and H_a

2.The reporter randomly samples 44 flights from the year 2020, and 40 reported an on time departure at DTW (with less than 15 minutes delay). What is the sampled proporton of on time flight departures from the year 2020 at DTW? Include the symbol/variable and the value.

3. Does this decrease in the number of flights at DTW cause the airport to be more efficient, with more on time departures? Provide support for your answer.

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