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The video states that a t-test is appropriate for comparing only two groups, whereas when there are three groups or more, a different approach called the analysis of variance (ANOVA) is required.

Conditions: There are three or more groups being compared.; The goal is to determine whether the group means differ.

The video states that a t-test is appropriate for comparing only two groups, whereas when there are three groups or more, a different approach called the analysis of variance (ANOVA) is required.

Conditions: There are three or more groups being compared.; The goal is to determine whether the group means differ.

The null hypothesis states that the mean reaction time for all three groups is the same. Symbolically, it is expressed as $H_0: \mu_1 = \mu_2 = \mu_3$.

Conditions: There are exactly three groups in the displayed example.; The compared quantity is mean reaction time.

The null hypothesis states that the mean reaction time for all three groups is the same. Symbolically, it is expressed as $H_0: \mu_1 = \mu_2 = \mu_3$.

Conditions: There are exactly three groups in the displayed example.; The compared quantity is mean reaction time.