7. A newspaper publisher wants to estimate the mean length of time all subscribers spend reading newspapers. To determine this estimate, the publisher takes a random sample of 15 people and
obtains the following times (in minutes):
11,9, 8, 10, 10, 9, 7, 11, 11, 7, 6, 9, 10, 8, 10
a. Construct and interpret the 90% and 95% confidence intervals.

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.

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0

answer: what are the following choices