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We conducted an a priori power analysis using G*Power Software for independent samples Students t-test 22 , assuming the group difference in mean change of the score is 2 (standard deviation 1.3) 7 and aiming to detect a significance level of 1% and statistical power of 90%, a total sample size of 30 participants (15 in each group) was needed

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Shaers association and the Retailers Association of Massachusetts are neutral on the proposed legislation, saying a statewide mandate would at least bring uniformity and predictability to doing business in Massachusetts

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