A study was conducted to compare the effects of two different interventions on p

Question

A study was conducted to compare the effects of two different interventions on pain due to plantar fascitis; (a) 6-weeks stretching plus eccentric strengening exercise and (b) 6-weeks stretching only. 60 subects were assigned to treatment a or b using consecutive assignment. A Visual Analog Scale using a ruler was used to measure pain before and after the intervention. Which statistic should be used to determine if there are differences between the two treatments in reducing pain? AnswersA-D A Mann Whitney U paired t-test c unpaired t-test D Chi-square [

Explanation / Answer

The mann whitney U test is used to measure difference in means. So this is not the correct test.

In a paired t test data is obtained from study subjects before and after a study, so there are 2 data points for each subject here. This is a possible test here.

In an Unpaired t test, the data groups are independent. This is not the case here, as both groups are sufferring from the same problem.

Chi square Test is used to calculate whether there is significant association between 2 variable (eg age groups and the brews they prefer). In this test we are not searching for association.

Therefore the paired t test is the correct answer.

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