topic06b

topic06b - large samples 2 1 ≠ 2 1 X X − 2 1 X X − 2...

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Topic 6B Confidence Interval Two sample cases 6.4 Confidence Interval for Difference of Population mean Large Samples: 1) if both sample sizes > 30 2) For pooled sample SD case , if n1+n2-2 >29 Pooled Sample SD 6.5 Confidence Interval for Difference of population proportions Point Estimate ± (Critical Value)(Standard Error) known, normal population or large sample 2 1 , σ 2 / α z 2 / z 2 , 2 / 2 1 + n n t unknown, normal population, small samples 2 1 = unknown, large samples 2 1 = unknown,
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Unformatted text preview: large samples 2 1 ≠ 2 1 X X − 2 1 X X − 2 1 X X − 2 1 X X − 2 / z 2 2 2 1 2 1 n S n S + ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + 2 1 2 1 1 n n S P ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + 2 1 2 1 1 n n S P 2 2 2 1 2 1 n n + ( ) ( )-1 level Confidence With ˆ 1 ˆ ˆ 1 ˆ ˆ ˆ 2 2 2 1 1 1 2 / 2 1 n p p n p p Z p p − + − ± − ( ) ( ) 2 1 1 2 1 2 2 2 2 1 1 − + − + − = n n S n S n S p...
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This note was uploaded on 09/15/2008 for the course ISMT 111 taught by Professor Wanxuhu during the Fall '08 term at HKUST.

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