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Functions and commands 371
ConfZ2prop The two-sample Normal confidence interval for the difference
of two proportions. Returns a list containing (in order):
• The lower critical Z-value
• The lower bound of the confidence interval
• The upper bound of the confidence interval
ConfZ2prop(x
1
,x
2
,n
1
,n
2
,C)
Example:
ConfZ2prop(21, 26, 50, 50, 0.95) returns
{-1.9599…, -0.2946…, 0.0946…)}
ConfT1mean The one-sample Student’s T confidence interval for a mean.
Returns a list containing (in order):
• The degrees of freedom
• The lower bound of the confidence interval
• The upper bound of the confidence interval
ConfT1mean( ,s,n,C)
Example:
ConfT1mean(0.461368, 0.2776, 50, 0.95) returns
{49, -.2009…, 0.5402…}
ConfT2mean The two-sample Student’s T confidence interval for the
difference of two means. Returns a list containing (in order):
• The degrees of freedom
• The lower bound of the confidence interval
• The upper bound of the confidence interval
ConfT2mean( , ,s
1
,s
2
,n
1
,n
2
,pooled,C)
Example:
ConfT2mean(0.461368, 0.522851, 0.2887, 0.2887,
50, 50, 0.95,0)
returns {98.0000…, -1.9844, -
0.1760…, 0.0531…)}
x
x
1
x
2