Strata or Cluster: You are surveying 20 streets in a neighborhood. Each street has 20 houses on it and each street has identical address numbers. For example, each street has address numbers being 100110021003 1019 There are two ways being proposed to survey these streets. Method One would randomly select 5 houses from each street to survey . Method Two would randomly select 5 unique numbers between 1001 to 1020 and choose all houses with that number Which of the following is the cluster?

Our star pitcher, foster enlight, can throw a pitch so fast that it gets to the catcher’s mitt before it leaves foster’s fingers! if the team wins a game then the probability that foster was pitching is 0.8 but only if foster had at least one day’s rest since his last pitching assignment. if foster does not have a day off and the team still wins, the probability that foster was pitching drops by half of what it was on the previous day. if the team wins three games in succession from the toronto tachyons and foster pitched in game #2, what is the probability that he pitched in one or more of the other games? (assume that foster did not pitch on the day before the first game of this three game series.)