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July 30, 2015

Homework Help: statistics

Posted by Anonymous on Saturday, November 3, 2012 at 9:40pm.

The average age for licensed drivers in the county
is μ  40.3 years with a standard deviation of  
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. 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  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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