Hypothesis testing is a formal procedure for investigating our ideas about the world using statistics. It is most often used by researchers to test predictions, called hypotheses. The first step in ...

The t statistic is used in the context of a t-test when doing hypothesis testing. Hypothesis tests start with a null hypothesis (Ho) which states there is no statistically significant difference.

Define a test statistic, level of significance, and the rejection region for a hypothesis test. Give the form of a rejection region. Perform tests concerning a true population variance. Compute the ...

In Hypothesis Testing 1, you were introduced to the ideas of hypothesis testing in the context of deciding whether a coin was fair or biased in favor of heads. In this section hypothesis testing ...

Confidence intervals and hypothesis tests are directly linked. Confidence intervals can be used to check the reasonableness of claims about the parameter. If someone claims the parameter is equal to ...

What exactly is an Anderson-Darling test? Testing for normality is often the first step in analyzing your data. Many ...

The mobile app market is evolving rapidly, and competitors are always on the move. This makes it crucial to thoroughly ...

The other chi-square tests and statistics described in this ... Under the null hypothesis (of equal proportions, specified frequencies, or specified proportions), this test statistic has an asymptotic ...

Parametric tests ... test are not met. While this is an advantage, it often comes at a cost of power (in the sense they are less likely to be able to detect a difference when a true difference exists) ...

It tests the null hypothesis that the distribution of the response variable ... by using the normal approximation for the distribution of the standardized test statistic. The standardized test ...

The first thing any scientist does before performing an experiment is to form a hypothesis about the experiment's outcome. This often takes the form of a null hypothesis, which is a statistical ...