The Press of Atlantic City, NJ, had a headline reading, \"Study: Female hormone

Question

The Press of Atlantic City, NJ, had a headline reading, "Study: Female hormone makes mind keener". Here is part of the report: "Halbreich said he tested 36 post-menopausal women before and after they started the estrogen therapy. He gave each one a battery of tests that measured such things as memory, hand-eye coordination, reflexes and the ability to learn new information and apply it to a problem. After estrogen therapy started, he said, there was a subtle but statistically significant increase in the mental scores of the patients." State the appropriate null and alternative hypotheses. What type of study is this? (i) matched pairs (ii) two-sample

Explanation / Answer

(1) Ho: There is no change in the mental scores of the patients (d-bar = 0)

Ha: There is an increase in the mental scores of the patients (d-bar > 0)

(2) This is a matched-pairs study.

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