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According to a national survey, the average commuting time for people who commute to a city...

According to a national survey, the average commuting time for people who commute to 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 believes that the commuting time has been increased due to the road construction. She wants to test this claim in her city. Taking a random sample of 21 commuters she calculates a mean time of 19.346 minutes and a standard deviation of 2.842 minutes. What is the critical value for α = .10 to test the hypotheses?

1.725

1.725 or -1.725

1.325

1.325 or -1.325

-1.325

math   Statistics-And-Probability   
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Answer #1

Answer: for the given data, Hou - 19.0 Hau > 19.0 This is a sight tailed test n=21; x=19.346; Sample Standard deviation (5) -

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