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April 16, 2014

Homework Help: probability and statistics

Posted by kiera on Friday, January 6, 2012 at 3:14pm.

the average age for licensed drivers in the country is u=40.3 years with a standard deviation of o= 13.2 years.
a. a researcher obtained a random sample of n=16 parking tickets and computed an average age of m=38.9 years for the drivers. is it reasonable to conclude that this set of n=16 people is a representative sample of licensed drivers?
b. the same researcher obtained a random sample of n=36 speeding tickets and computed an average age of m=36.2 years for the drivers. compute the z-score for the sample mean and find the probability of obtaining an average age this young or younger for a random sample of licensed drivers. is it reasonable to conclude that this set of n= 36 people is a representative sample of licensed drivers?

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