Wolfram|Alpha Statistics & Data Analysis

Statistical Inference

Sample Size Determination

find sample size needed to estimate a binomial parameter
sample size for binomial parameter
find sample size needed to estimate a population mean
sample size sigma=12.5, margin of error .03

Confidence Intervals

compute a confidence interval for a binomial parameter
binomial confidence interval n=120, p-hat=0.42 Jeffreys interval formula
find a confidence interval for a difference between binomial parameters
proportion difference confidence interval
compute a confidence interval for a population mean
confidence interval for population mean t-interval xbar=4.15, s=0.32, n=100
find a confidence interval for a difference between population means
mean difference confidence interval
find a confidence interval for the standard deviation of a normal population
confidence interval for a standard deviation
find a confidence interval for the variance of a normal population
CI for variance, s^2=21.4, n=300

Hypothesis Testing

test for a binomial parameter
test for binomial parameter p0=0.75, p-hat=0.84, n=40
test for a difference between binomial parameters
two proportion hypothesis test
test for a population mean
z-test for population mean t-test mu0=250, xbar=264, s=18, n=60
test for a difference between population means
hypothesis test for the difference between two means