Week 8 Study Notes

35 views4 pages
13 Dec 2010
School
Department
Course
Professor
GGR 270 Lecture 8 November 3, 2010-12-13
1-á á á/2Z á/2
.90 .10 .05 1.645
.95 .05 .025 1.96
.98 .02 .01 2.33
.99 .01 .005 2.58
Point Estimate
¯x is the best point estimate of µ
Z (Standard Error)
Z(
Z defines level of confidence
95% = 1.96 (
90% = 1.65(
99% = 2.58(
Also have point estimate for proportions:
Z
Confidence Interval
Place interval around the sample mean x) and state with a measurable level of confidence,
the true population mean (µ) lies within this interval
¯x +/-
Or
¯x +/-
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