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
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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
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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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