# Tag Archives: significance test

## Dixon’s Q-Test

A data point that is not consistent with the remaining data is called an outlier. Consider, for example, an experiment in which we determine the mass for each penny in a sample of pennies; we might encounter an outlier for … Continue reading

## t-Test

The figure below shows the relationship between confidence intervals and the result of a t-test. (a) The shaded area under the normal distribution curve shows the confidence interval for the sample based on texp. Based on the sample, we expect … Continue reading

## One-Tailed vs. Two-Tailed Significance Tests

Example showing (a) a two-tailed, and (b and c) a one-tailed, significance test of an sample’s experimental mean relative to the population’s true mean. The normal distribution curves are drawn using the sample’s mean and standard deviation. For α = 0.05, the … Continue reading