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U13 L3 Practice Packet six months [ 36.6 71.8 ]€¦ · U13 L3 Practice Packet. U13 L4...

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U13 L4 ZScores.notebook November 01, 2016 mean = 54.2 s.d. = 17.6 [ 36.6 71.8 ] six months 119.8 .6 = 2 above 2.3% of 5,000 = 115 boxes U13 L3 Practice Packet
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Page 1: U13 L3 Practice Packet six months [ 36.6  71.8 ]€¦ · U13 L3 Practice Packet. U13 L4 ZScores.notebook November 01, 2016 ...

U13 L4 Z­Scores.notebook November 01, 2016

mean = 54.2

s.d. = 17.6

[ 36.6 ­ 71.8 ]

six months 

11­9.8.6

= 2 above 2.3% of 5,000 = 115 boxes

U13 L3 Practice Packet

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U13 L4 Z­Scores.notebook November 01, 2016

U13 L4Z­Scores

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U13 L4 Z­Scores.notebook November 01, 2016

Z­ Scores

Z­Scores are the exact standard deviations.

Example: 1.35 standard deviations

* We still have (­) that represent below the mean and (+) to represent above the mean. 

The normal curve only offers us standard deviations at .5 increments.

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U13 L4 Z­Scores.notebook November 01, 2016

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U13 L4 Z­Scores.notebook November 01, 2016

The formula used to calculate z­scores is:

z­score = data point ­ mean

Ex #1 

Calculate the z­score for a data point of 400 in a set of data with a mean of 500 and a standard deviation of 50.

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U13 L4 Z­Scores.notebook November 01, 2016

Comparing SAT scores VS. ACT scores

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U13 L4 Z­Scores.notebook November 01, 2016

Page 8: U13 L3 Practice Packet six months [ 36.6  71.8 ]€¦ · U13 L3 Practice Packet. U13 L4 ZScores.notebook November 01, 2016 ...

U13 L4 Z­Scores.notebook November 01, 2016

Page 9: U13 L3 Practice Packet six months [ 36.6  71.8 ]€¦ · U13 L3 Practice Packet. U13 L4 ZScores.notebook November 01, 2016 ...

U13 L4 Z­Scores.notebook November 01, 2016

U13 L4

Z Scores

Homework Online


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