test at the .10 level of significance whether the mean life of all trees in this city is less than 28 years.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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City planners wish to estimate the mean life of the most commonly planted trees in its urban setting. A sample of 25 recently felled trees planted by the city yielded a mean of 26.8 years, with a standard deviation of 2.25 years. A recent USDA paper analyzing tree life expectancy in urban areas found the typical street tree lived between 19 and 28 years. Assuming a normal distribution of times of tree lives, test at the .10 level of significance whether the mean life of all trees in this city is less than 28 years.
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