With a previous contractor, the mean time to replace a streetlight was 3.2 days. A city councilwoman

Question:

With a previous contractor, the mean time to replace a streetlight was 3.2 days. A city councilwoman thinks that the new contractor is not getting the streetlights replaced as quickly. She selects a random sample of 12 streetlight service calls and obtains the following times to replacement (in days).

With a previous contractor, the mean time to replace a

(a) Because the sample size is small, she must verify that replacement time is normally distributed and the sample does not contain any outliers. The normal probability plot and boxplot are shown. Are the conditions for testing the hypothesis satisied?

With a previous contractor, the mean time to replace a

(b) Is there enough evidence to support the councilwoman€™s belief at the α = 0.05 level of significance?

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For  book-img-for-question

Fundamentals Of Statistics

ISBN: 9780321844606

4th Edition

Authors: Michael Sullivan III

Question Posted: