Question

What is the Z score for items 9 and 11. Are they truly abnormal? Data 1...

What is the Z score for items 9 and 11. Are they truly abnormal?

Data

1

223

2

200

3

154

4

217

5

223

6

157

7

178

8

159

9

350

10

243

11

325

12

298
Math   Statistics-And-Probability   
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Homework Answers

Answer #1

from above:

Z score for items 9 =(Xbar-mean)/standard deviation =(350-227.25)/66.16=1.86

Z score for items 11 =(Xbar-mean)/standard deviation =(350-325)/66.16=0.38

as z score absolute value is not higher than 2 ; therefore these are not truly abnormal.

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