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Cutoffs:Find the corresponding Z score(s). Round answer to 2 decimal places! Cutoff for...

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torpue | Student | eNoter

Posted November 13, 2010 at 8:53 AM via web

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Cutoffs:Find the corresponding Z score(s). Round answer to 2 decimal places! Cutoff for the bottom 37%.

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neela | High School Teacher | Valedictorian

Posted November 13, 2010 at 1:32 PM (Answer #1)

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To find the cut off 37% from the bottom of z scores.

The z scores are the standard normal variates with a normal distribution.

So  we have  probabilty of z is <= x   such that this probability is 37%.

Therefore P(z < = x) = 37%.

We know that Z has the standard normal distribution. So P(z<=0) = 0.5.

Therefore  p(z > -x) = 0.37 = , as normal distribution is sy mmetrical.

Therefore P(0 <= z< - x) = 0.5+(0.5-37) = 1-.37 = 0.63.

From normal probablity tables ,  -x = 0.332. Or x = -0.332.

Therefore , the below cut off  37% of the z scores is at z = -0.332 , or  at z = -0.33 (rounded of to 2 decimals ).

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