Suppose a researcher conducts an ANOVA analysis that compares three different treatments for depression: medication, cognitive, behavioral therapy, and a control condition. What is the null hypothesis for the ANOVA analysis?a. All three groups have different mean depression levelsb. At least two of the three groups have different mean depression levelsc. All three groups have identical mean depression levelsd. At least one of the three groups has a different mean depression level

The means of three or more independent (unrelated) groups are examined using the one-way analysis of variance (ANOVA) to see if there are any statistically significant differences.

When using ANOVA techniques, what is the research hypothesis?

In ANOVA, the null hypothesis is always "no difference in means." The research or alternative hypothesis is typically expressed in words rather than mathematical symbols and always assumes that the means are not all equal.

How is ANOVA utilized in research?

By comparing the means of various samples, ANOVA determines whether one or more factors have an effect. We can use ANOVA to demonstrate or disprove whether or not each medication treatment was equally effective. One more measure to look at the examples is known as a t-test. The results of the t-test and ANOVA are identical when we have only two samples.

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