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why did the authors choose a double-blind procedure? To avoid having to disclose the name of the manufacturer To reduce the number of participants needed
why did the authors choose a double-blind procedure? To avoid having to disclose the name of the manufacturer To reduce the number of participants needed for the study To investigate possible placebo effects To avoid being accused of scientific fraud
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Cambridge IGCSE And O Level Additional Mathematics
Authors: Val Hanrahan, Jeanette Powell
1st Edition
1510421645, 978-1510421646
