Question

Rain Simpson, Alsen, and Eden (Technometrics 1975) reported the results of trials in which clouds were seeded and the amount of rainfall recorded. The authors reported 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. Which test is appropriate for these data? Explain your choice. Using the test you select, state your conclusion.

Paired t-Test of m(1 - 2) Mean of Paired Differences = -277.39615 t-Statistic = -3.641 w/25 df P = 0.0012 2-Sample t-Test of m1 - m2 Difference Between Means = -277.4 t-Statistic = -1.998 w/33 df P = 0.0538

a) Which of these tests is appropriate for these data? Explain. Clearly state the the assumption needed to justify the answer

b) Using the test you selected, state your conclusion. include assessment of the strength of evidence

Answer 1