Cloud seeding Simpson, Alsen, and Eden (Technometrics1975) report the results of trials in which clouds were seeded and the amount of rainfall recorded. The authors report on 26 seeded and 26 unseeded...

Cloud seeding
Simpson, Alsen, and Eden (Technometrics1975) report the results of trials in which clouds were seeded and the amount of rainfall recorded. The authors report on 26 seeded and 26 unseeded clouds in order of the amount of rainfall, largest amount first. Here are two possible tests to study the question of whether cloud seeding works.

Cloud seeding Simpson, Alsen, and Eden (Technometrics 1975) report the results of trials in which clouds were seeded and the amount of rainfall recorded. The authors report on 26 seeded and 26 unseeded clouds in order of the amount of rainfall, largest amount first. Here are two possible tests to study the question of whether cloud seeding works. a) Which of these tests is appropriate for these data? Explain. b) Using the test you selected, state your conclusion. ( ) pairedTestof12 MeanofpairedDifferences277.39615 statistic3.641/25 p0.0012 2sampleTestof12 Differencebetweenmeans277.4 statistics1.998/33df 0.0538 t twdf t tw p m mm -- =- -=- = --- =- -=- =