Statistics Help Please!!!
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Statistics Help Please!!!

[From: ] [author: ] [Date: 12-11-12] [Hit: ]
what is the probability of a sample of 250 Americans producing a sample proportion as low as the one from this sample?The sample proportion is equal to 112/250 = 0.Now convert to z-values ...Now using a Standard Normal table .......
A simple random sample of 250 Americans revealed that 112 of them owned a DVD player. DVD companies, as an industry, brag that half of all Americans own a DVD player.

Assuming that the DVD companies are correct, what is the probability of a sample of 250 Americans producing a sample proportion as low as the one from this sample?

-
Kristin

The sample proportion is equal to 112/250 = 0.448

Now convert to z-values ...

P( p < 0.448) = P[ z < (0.448 - 0.5) / sqrt (0.5 x 0.5 / 250)] = P( z < -1.644)

Now using a Standard Normal table ...

P( z < -1.644) = 0.05 or 5%

Hope that helped
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