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an airline claims that 65 of its flights depart

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 calculated test statistic at the 5% level of significance?

a. z = -4.20 b. z = -0.42 c. z = 0.42 d. z = 4.20

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Basic Statistics: an airline claims that 65 of its flights depart

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