Recap on Z value calculations.

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Presentation transcript:

Recap on Z value calculations. Normal Distribution Recap on Z value calculations.

P (0 < Z < 1.5)

Subtracting

P( 1 < Z < 1.5)

P( 1 < Z < 1.5) Use table to get the value of P( 0 < z < 1.5)

P( 1 < Z < 1.5) Use Table to get the value of P( 0 < Z < 1)

P( 1 < Z < 1.5) Take away your answers to leave P(1 < Z < 1.5)

Subtracting

P ( Z > 1.5)

P ( Z > 1.5)

P ( Z > 1.5) Use table to look up value of P ( 0 < Z < 1.5)

P ( Z > 1.5) Take that value away from 0.5

Adding

P ( Z < 1.5)

P ( Z < 1.5) This area is 0.5

P ( Z < 1.5) Look up the value of P ( 0 < Z < 1.5)

P ( Z < 1.5) Add 0.5 and your answer for P ( 0 < Z < 1.5)

Adding

P ( -0.5 < Z < 1.5)

P ( -0.5 < Z < 1.5) Look up the value of P ( 0 < Z < 0.5) which is the same as P ( -0.5 < Z < 0) due to symmetry

P ( -0.5 < Z < 1.5) Look up the value of P ( 0 < Z < 1.5)

P ( -0.5 < Z < 1.5) Add your two answers together.

You must draw a diagram to help you identify the values you need from the table. Sketch a normal curve. Shade in the part you are asked to calculate. Think whether you need to add or subtract.