(a) Is this evidence at the 5% level of significance that the population mean commute time for people using this bridge has decreased? (b)Upon inspection of commute times, it is shown that the distribution for drivers using this bridge is slightly skewed to the right. Does this discovery change your conclusion in part (a)? Explain why or why not. (c) It is determined that the power of your test in part (a) was 0.89. Explain what this number means in the context of this question.
The New York City Transit Authority is investigating ways to decrease commute time for people driving into New York City.
The mean commute time for people driving into the city was 43 minutes last year. After instituting different traffic patterns at one
of the bridges into the city, a sample of 40 drivers that use this bridge have a mean commute time of 38 minutes with standard
deviation 17 minutes.
(a) Is this evidence at the 5% level of significance that the population mean commute time for people using this bridge has
decreased?
(b)Upon inspection of commute times, it is shown that the distribution for drivers using this bridge is slightly skewed to the
right. Does this discovery change your conclusion in part (a)? Explain why or why not.
(c) It is determined that the power of your test in part (a) was 0.89. Explain what this number means in the context of this
question.
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