Test Slope

Sometimes we want to test the hypothesis that the slope of a least-squares regression line could just as well have come from a population in which the slope is really zero. To do so choose Hypothesis Test from the Analyze menu, then choose Test Slope from the popup.

Drag two numeric attributes into the appropriate slots at the top of the test.

Note: The illustration at right was made in "non-verbose" mode using the Verbose command in the Test menu.

Fathom computes the equation of the least-squares regression line, the   t-statistic and then the probability that it would be observed if the slope were really zero.