Can anyone answer this question? 1. Only two studies have evaluated the therapeu

Question

Can anyone answer this question?

1. Only two studies have evaluated the therapeutic effectiveness of a new treatment for insomnia. Cochran (2008) used two independent groups each of size N=22, and Washington (2008) used two groups each with N=18. Each study reported the difference between means for the new treatment and the current treatment. Difference between the means is equal to the mean for new treatment minus the mean for the current treatment for insomnia. A positive difference indicates an advantage for the new treatment.

Cochran (2008) found that the new treatment showed a statistically significant advantage over the current treatment: M (difference) = 3.61, SD (difference) = 6.97, t(42) = 2.43, p = .02. The study by Washington (2008) found no statistically significant difference between the two treatment means: M (difference) = 2.23, SD (difference) = 7.59, t(34) = 1.25, p = .22.

Select the statement that best describes your understanding of this information:

Inconsistent: The Cochran result is clearly statistically significant at the .05 level, whereas the Washington result is clearly not statistically significant. The two results conflict. We can’t say whether the new treatment is effective and we should examine the two studies to try to find out why one found an effect and the other didn’t. Further research is required to investigate whey the treatment works in some cases, but not others.

Equivocal: One result is statistically significant, and the other nonsignificant, although the two are in the same direction. We have equivocal findings and can’t say whether the new treatment is effective. Further research is required.

Consistent: The two results are in the same direction, and the size of the mean difference is fairly similar in the two studies. The two studies reinforce each other, even though one is statistically significant and the other is not. The two results are consistent and, considered together, provide fairly strong evidence that the treatment is effective.

Explanation / Answer

it is equivocal from the above statements i understood that one is no signicant so we can accept but other sample is significant so we cannot accept the new treatment for insomnia as it is related to a treatment and we took small sample so research further on different samples and come to a conclution.

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