February 20

# February 20 - Step 1 Draw it Step 2 Ask does it butt up to...

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Unformatted text preview: Step 1: Draw it. Step 2: Ask, does it butt up to the mean? Find the area that lies between Z=0 and Z=1.82 YES Step 3: Look up 1.82z to find its area. Step 1: Draw it. Step 2: Ask, does it butt up to the mean? Yes. Step 3: Look up 1.82z to find its area. Answer: .4656 Find the area that lies between Z=0 Find the area that lies between Z=0 and Z=1.82 and Z=1.82 Step 1: Draw it. Step 2: Ask, does it butt up to the mean? Find the area to the left of Find the area to the left of Z= -.86 Z= -.86 No. Step 3: Look up .86z to find its area. Step 1: Draw it. Step 2: Ask, does it butt up to the mean? No. Step 3: Look up .86z to find its area. Step 4: Subtract this from .5000. Answer: .5000 - .3051 = .1949 Find the area to the left of Find the area to the left of Z= -.86 Z= -.86 Find the area under Z=-1.93 and Z=2.37 Step 1: Draw it. Step 2: Ask, does it butt up to the mean? No. Step 3: Look up 1.93z to find its area. Subtract this from .5000. .5000-.4732=. 0268 Step 4: Look up 2.37z to find its area. Find the area under Z=-1.93 and Z=2.37 (Continued) Find the area under Z=-1.93 and Z=2.37 (Continued) Subtract this from .5000. .5000-.4911=. 0089 Step 5: Add these two numbers together to find the total area. Answer: .0268+.0089=.0357 What is the Z score for .4115 Area? Step 1: Start in the middle of the chart. Step 2: Find the Area. Step 3: Look across to the right and up for the answer. + Step 1: Start in the middle of the chart. Step 2: Find the Area . Step 3: Look across to the right and up for the answer. Answer = 1.35Z What is the Z score for .4115 Area? Memory Peg Memory Peg .5000 .5000 Area Zs Zs Zs The Skewed Curve The Skewed Curve • Mean, median and mode do not all fall on the center line; mean is pulled toward tail • Due to large number of outliers The Skewed Curve The Skewed Curve Negative Skew Negative Skew Tail points to the left Lots of high scores Positive Skew Positive Skew Tail points to the right Lots of low scores The Skewed Curve The Skewed Curve Median = 600 Mode = 1000 Mean = 400 Is this curve skewed?...
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February 20 - Step 1 Draw it Step 2 Ask does it butt up to...

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