Length of Growing Seasons The growing seasons for a random

Chapter 7, Problem 20

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QUESTION:

Length of Growing Seasons The growing seasons for a random sample of 35 U.S. cities were recorded, yielding a sample mean of 190.7 days and the population standard deviation of 54.2 days. Estimate the true mean population of the growing season with 95% confidence. Source: The Old Farmers Almanac. 172.74 _ m _ 208.66

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QUESTION:

Length of Growing Seasons The growing seasons for a random sample of 35 U.S. cities were recorded, yielding a sample mean of 190.7 days and the population standard deviation of 54.2 days. Estimate the true mean population of the growing season with 95% confidence. Source: The Old Farmers Almanac. 172.74 _ m _ 208.66

ANSWER:

Step 1 of 2

Given:

For confidence level , determine  using table  (look up  in the table, the z-score is then the found -score with opposite sign):

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