1. Which one of the following is a stratified random sample
a) The CEO of Ace Manufacturing Company selects the employees from one branch to survey
b) The CEO of a company selects the same fraction of employees from each branch to survey.
c) A department store randomly selects a name from an alphabetic list of customers and selects every 10th customer before and after that name to conduct a survey.
d) The school principal interviews one class to survey student views on dr ess co de
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The school principal interviews one class to survey student views on dr ess co de
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