Monday

March 30, 2015

March 30, 2015

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

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?

- probability and statistics -
**PsyDAG**, Sunday, January 8, 2012 at 12:44pmZ = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√n

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.

**Answer this Question**

**Related Questions**

statistics - The average age for licensed drivers in the county is μ 40.3...

statistics - The average age for licensed drivers in a county is µ= 42.6, σ...

Statistics - An April 15, 2002 report in Time Magazine stated that the average ...

Statistics - An April 15, 2002 report in Time Magazine stated that the average ...

statistics - An April 15, 2002 report in Time Magazine stated that the average ...

statistics - An April 15, 2002 report in Time Magazine stated that the average ...

STATISTICS - An April 15, 2002 report in Time Magazine stated that the average ...

statistics - An April 15, 2002 report in Time Magazine stated that the average ...

statistics - An April 15, 2002 report in Time Magazine stated that the average ...

Statistics - The average age of chemical engineers is 37 years with a standard ...