A travel magazine claims that the West Coast Airline’s on-time arrival rate is only 78% or less. West Coast wishes to prove that the magazine is wrong. West coast takes a random sample of 750 flights and finds that 615 were on time. Test at the 4% level of significance if there is sufficient evidence to prove that the magazine is wrong (i.e. to prove that the on-time arrival rate is greater than 78%). Make sure to state the null and alternative hypotheses and to report your conclusion.