Class size freshman 2200 sophomore 1800 junior 1400 senior 1100 heidi is doing a study for her statistics class, and she needs to obtain a random sample of students from a local college. [the enrollment at the college is summarized in the table shown.] choose the best way to obtain a sample of size 50. a) select 50 students from a new student orientation session. b) select 50 students from participants in a career day presentation. c) select 50 students from the stadium homestands during a football game. d) select only seniors because they have been attending the school longer. which is the answer

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step-by-step explanation:

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.