Statistical significance testing

One-sample test to compare sample mean or median to population estimate

Comparison value (mean or median)

Type of statistical test to be done

Sign test (Non-parametric data)

1-sample t-test (Parametric data)

Significance level

Tails

1 tailed

2 tailed

Digits after decimal point

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Compare a sample mean (or median) to a population estimate (default 0) using the 1-sample t-test (or sign test for medians). P-values can be calculated for one- or two-tailed comparisons, and are compared to a specified significance level.

Inputs are:

• population estimate of mean or median for comparison (default value is 0);
• whether to use t-test (means) or sign test (medians);
• specified significance level;
• number of digits to display in results;
• whether test is one-tailed or two-tailed; and
• sample data.

Outputs include:

• A summary of the data provided;
• Confidence limits (based on specified significance level) for the sample mean or median;
• P values for the difference between sample mean/median and the specified value;
• interpretation of the results; and
• plots of the data distribution and confidence limits for mean/median.