In the following, state whether the data adequately addresses the (implied) statistical question.
a) Have new bad weather protocols effectively reduced flight delay times at the John F. Kennedy (JFK) airport? JFK data from six bad weather events before the new protocols and from six bad weather events after the new protocol were used to compare the mean delay times (in minutes).
b) To determine if mean cell phone battery life has improved, the mean cost of five cell phone models was obtained.
c) For a research project, a student aimed to establish if there was a difference in the mean SAT scores of five different universities. The student requested last year admissions data from new students at his school.