The Journal of the American Medical Association published a report in 2008 conce

Question

The Journal of the American Medical Association published a report in 2008 concerning the use of St. John's wort in children who have been diagnosed with ADHD. Children were randomly assigned to two groups; one group received St. John's wort and the other received a placebo (sugar pill). The results were:

Part 1: What percentage of children in the sample showed improvement in ADHD symptoms? Use two decimal places. ______

If H0 is true, what percentage of children who received the placebo should show signs of improvement? Use two decimal places. ______

Part 2: What percentage of the observed chidren who received the placebo showed signs of improvment? Use two decimal paces.

__________

What percentage of the observed chidren who received the St. John's wort showed signs of improvment? Use two decimal paces. _____

Part 3:
Run the chi-square test, typing the data into Minitab on your own. Using three decimal places, the chi-square statistic is ______

Explanation / Answer

Part 1: What percentage of children in the sample showed improvement in ADHD symptoms? Use two decimal places.

Ans : (15+13)/Grand total = 28/54 = 0.52

If H0 is true, what percentage of children who received the placebo should show signs of improvement? Use two decimal places. ______

Ans : 27*28/54 = 14.00

Part 2: What percentage of the observed chidren who received the placebo showed signs of improvment? Use two decimal paces.

Ans: 13/27 = 0.48

What percentage of the observed chidren who received the St. John's wort showed signs of improvment? Use two decimal paces. _____

Ans: 15/27 = 0.56

Part 3:
Run the chi-square test, typing the data into Minitab on your own. Using three decimal places, the chi-square statistic is 0.297

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