Expedia would like to test the hypothesis that the proportion of United Airline flights that arrive on-time is less than 0.80. A random sample of 110 United Airline flights found that 82 arrived on-time. Expedia would like to set ? = 0.02. The test statistic for this hypothesis test would be ________.
zp = -2.20
zp = -1.72
zp = -2.77
zp = -1.43