A researcher selects a sample and administers a treatment for anxiety to the individuals in the sample. If the sample is used for a hypothesis test, what does the null hypothesis ( H 0) put forth about the treatment?     a. The treatment multiplies each anxiety score by a constant.   b. The treatment has an effect on anxiety.   c. The treatment has no effect on anxiety.   d. The treatment divides each anxiety score by a constant.

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.