Above which number does 10% of z-scores fall? Between what two z-scores does 95% of the...
Above which number does 10% of z-scores fall?
Between what two z-scores does 95% of the data fall (go into the table- don't use the Empirical rule for this one.)?
Homework Answers
solution:
a
P(Z > z ) =1 - 10%= 1 -0.10 =0.9
z= 1.28 using z table
b
middle 95% of score is
P(-z < Z < z) = 0.95
P(Z < z) - P(Z < -z) = 0.95
2 P(Z < z) - 1 = 0.95
2 P(Z < z) = 1 + 0. 95= 1.95
P(Z < z) = 1.95/ 2 = 0.975
P(Z <1.96 ) = 0.975
z ±1.96
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