9 - October 2 CLT-Confidence Intervals

# 9 - October 2 CLT-Confidence Intervals - You Can't Send a...

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You Can't Send a Duck to Eagle School !

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GROUP WORK DAY Thursday October 4, 2007 NO CLASS MEETING
Normal Curve Chart Normal Curve Chart AREA AREA Because the curve is symmetrical (a mirror of itself) the charts are developed for only ½ of the total area. We must adjust for this according to our needs.

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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.

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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

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Step 1: Draw it. Step 2: Ask, does it butt up to the mean? Find the area to the left of Z= -.86 Find the area to the left of Z= -.86 No. Step 3: Look up .86z to find its area.

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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 Z= -.86 Find the area to the left of Z= -.86
Find the area to the left of Z=-1.93 and to the right of 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.

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Subtract this from .5000. .5000-.4732=. 0268 Step 4: Look up 2.37z to find its area. Find the area to the left of Z=-1.93 and to the right of Z=2.37 (Continued)

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Find the area to the left of Z=-1.93 and to the right of Z=2.37 (Continued) Subtract this from .5000.

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• Fall '07
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