Researchers recruited 20 patients who experience regular muscle cramping to part

Question

Researchers recruited 20 patients who experience regular muscle cramping to participate in a study evaluating the relationship between stress and muscle cramps. All subjects met in a classroom on campus one morning. The subjects knew they were participating in a study of muscle cramps, but were unaware of what they would be doing that morning. Half the subjects were randomly chosen to leave the room with a research assistant who took them to be exposed to increased stress by being placed into an elevator that fell rapidly and stopped abruptly and the other half were left at no (i.e., baseline) stress in the classroom. All subjects were then asked to report whether or not they experienced muscle cramps within the next 6 hours. Once the data were collected, the results were compared for the two groups.

Suppose the results showed that the group exposed to stress (elevator) was much more likely to experience muscle cramps within the next 6 hours than the group who experienced baseline stress. Based on these study results, can the researchers conclude that being exposed to elevator stress causes muscle cramps? Why or why not? Be specific and refer to features of the sampling methods and/or study design of this study to support your answer.

Explanation / Answer

let group1=exposed to stress (elevator) and group2=experienced baseline stress

here we use two sample independent measure research design t-test with

null hypothesis H0:mean1=mean2 and

alternate hypothesis H1:mean1mean2

t=(mean1-mean2)/((sp*(1/n1 +1/n2)1/2) and sp2=((n1-1)s12+(n2-1)s22)/n and with df is n=n1+n2-2

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