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Stat Testing
Is the data weighted?: Yes No
Do the groups overlap (i.e. Total vs Male)?: Yes No
  Group 1 Group 2



Unweighted Base:
Weighted Base:
    Effective Base:
Testing: Percentages Means



Percentages: % %
Means:
Standard Deviation:
t-value:  
p-value: (2 tailed test)
Significant at: % Confidence Level
 

 



The left side of the calculator is for statistical testing of two groups on a single variable. The point estimates that are tested can either be percentages or means and can be based either on unweighted or weighted data. The two groups are allowed to overlap.
Reliability for a 50% Proportion
Margin of Error
Base:
Confidence Level: %
Margin of Error +/-: %
 

 

Base Size Calculator
Margin of Error +/-: %
Confidence Level: %
Base Size Needed:
 

 



The right side of the calculator is for estimating degree of reliability around a 50% estimate for a proportion. It either calculates the margin of error given a base size n or calculates the base size n required to attain a specified margin of error.
Both the statistical test results and the reliability results assume a two-tailed (non-directional) effect of random samples of the population under study.
Click here for further specific assumptions.