An SRS of 100 flights by Speedy Airlines showed that 64 were on time. An SRS of 100 flights by Happy Airlinesshowed that 80 were on time. Letpbe the proportion of on-time flights for all Speedy Airline flights, and letpbe theSHproportion of all on-time flights for all Happy Airlines flights. A 95% confidence interval for the differencep-pis -0.166 to 0.066. Based on this confidence interval, which conclusion is best