An airline claims that 65% of its flights depart on time

An airline claims that 65% of its flights depart on time. A sample of 100 flights was examined and it was determined that 63% left on time. If the goal is to test whether less than 65% of the flights depart on time, what is the value of the critical test statistic at the 5% level of significance?

a. t = -1.645 b. t = -1.96 c. z = -1.645 d. z = -1.96

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