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Question
According to a national survey, the average commuting time for people living in a city with a population of 1 to 3 million is 19.0 minutes. Suppose a researcher lives in a city with a population of 2.4 million and wants to test this claim for her city. Taking a random sample of 20 commuters, she calculates a mean time of 19.346 minutes and a standard deviation of 2.842 minutes. Test the hypotheses at 
= .10 using the critical value rule.
Answer
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A. average
B. median
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The __________________ is a nonparametric counterpart of a small-sample t test for comparing two independent population locations.
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Q:
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If a company is using an chart for a given process with measurement data, it is generally not important or necessary to use an R chart or s chart.
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