The National Weather Bureau’s ACN cloud-seeding project was carried out in the states of...

The National Weather Bureau’s ACN cloud-seeding project was carried out in the states of Oregon and Washington. Cloud seeding was accomplished by dispersing dry ice from an aircraft; only clouds that were deemed “ripe” for seeding were candidates for seeding. On each occasion, a decision was made at random whether to seed, the probability of seeding being 2/ 3 . This resulted in 22 seeded and 13 control cases. Three types of targets were considered, two of which are dealt with in this problem. Type I targets were large geographical areas downwind from the seeding; type II targets were sections of type I targets located so as to have, theoretically, the greatest sensitivity to cloud seeding. The following table gives the average target rainfalls (in inches) for the seeded and control cases, listed in chronological order. Is there evidence that seeding has an effect on either type of target? In what ways is the design of this experiment different from that of the one in Problem 45?