Question

TYPED ANSWERS ONLY

A team of psychologists have developed an experimental treatment program for a learning disorder with the expectation that the treatment would enable recipients to score higher than before on a test of learning ability. To test the treatment, they randomly select a pool of 30 volunteers who have been diagnosed with the disorder and who have volunteered for the treatment program. Following treatment, the participants are retested on the learning ability test and their scores compared to earlier scores. Complete the following. (1 point each)

• What statistical test would be appropriate in this case? Explain the rationale for your answer.
• State the null and alternative hypotheses in words.
• State the null and alternative hypotheses in statistical symbols
• Would the test be right-tailed, left-tailed or two-tailed? Explain the rationale for your answer.
• Describe a potentially confounding variable and explain how that might affect the conclusions from the study.Describe a potentially confounding variable and explain how that might affect the conclusions from the study.

Answer 1