Upload
duongdan
View
217
Download
0
Embed Size (px)
Citation preview
Generalization to any confidence level
nherrorherrorzherror SS
NS))(1)(()( −
±
• Values of zN for 2-Sided N% Confidence IntervalsConfidence Level N%: 50% 68% 80% 90% 95% 98% 99%Constant zn: 0.67 1.00 1.28 1.64 1.96 2.33 2.58
Rule of thumb
• Binomial is approximated by Normal distribution as long as n >= 30 or when np(1-p) >= 5
• For smaller values of n it is wise to use a table giving exact values for the binomial distribution
LEVEL CURVES
• Slice the surface with horizontal planes which the locus of points with the quadratic form