Compare Average to Reference Average Design

Use this design dialog when you want to compare a site mean to a reference (background) mean.

This dialog contains some inputs at the top to guide you to the appropriate design:

Can assume the data will be normally distributed

Site of interest and reference area have equal / unequal sample sizes

Ordinary / Multiple Increment sampling method

Type of Surface (for non-normally distributed data)

Type of Calculation (for non-normally distributed data)

These choices will result in one of the following four designs to be displayed on the dialog:

Ordinary (Two-Sample t-Test) Sampling

Two-Sample t-Test for Unequal Variance Sampling

Multiple Increment Sampling

MARSSIM WRS Test One Analyte at a Time Sampling

MARSSIM WRS Test Surface Soil Unity Rule Sampling

MARSSIM WRS Test Building Surfaces Unity Rule Sampling

MARSSIM WRS Test Building Surfaces Gross Activity Sampling