Many people take ginkgo supplements advertised to improve memory. In a study to

Question

Many people take ginkgo supplements advertised to improve memory. In a study to determine whether this over-the-counter supplement is effective, elderly adults were assigned at random to either a treatment group or a control group. The 104 participants who were assigned to the treatment group took 40mg of ginkgo three times a day for six weeks. The 115 participants assigned to the control group took a placebo three times a day for six weeks. At the end of the study, the participants were given the Wechsler Memory Scale (higher scores on this scale indicate better memory function). Researchers would like to use the data collected to estimate the mean difference in memory scores for the two groups. a. To address the question of interest, which type of inference would be most appropriate? hypothesis test confidence interval b. Which of the following formulas would be used for the inference selected in part b? (v1-92) -0 Tt ni n

Explanation / Answer

a)

In this study researcher are testing that weather ginko supplements improves the memory or not .and for such testing we go for hypothesis esting .

hypothesis test is the correct answer

b)

here we have given two data set one is ginko supplememt and other is Placebo data.

so clearly it is a two sample test as there are two samle are involved in study.

Option 3, 5 6 and 7 are used to calculate confidence interval so, this option is not our answer

now remaining option 1, 2 and 4 out of which option 1 is used when we have one sample and option 4 is used when there is paired sample data.

Now option 2 is used when we have two sampled data and and this test is used to compare the means of tw independent population.

so option 2 is correct answer

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