You want to estimate the portion of time that your favorite radio station is pla

Question

You want to estimate the portion of time that your favorite radio station is playing music. Which of the followings are a independent trials? (can be more than one)

Turn on the radio and record if it is playing music or not. repeat this every 10 minutes for 24 hours.

Turn on the radio and record if it is playing music or not. Repeat this every 15 seconds for the next 3 hours.

Select a random time in a (24-hour) day; and turn on the radio and record if it is playing music or not.

Repeat this for next 10 days. Turn on the radio and record if it is playing music or not. Do the same for the next 10 days, at the same time.

Explanation / Answer

In the second option, you check at every 15 seconds. So sample is not independent becuase some time radio program goes on 3 or more hours.

Repeat this for next 10 days. Turn on the radio and record if it is playing music or not. Do the same for the next 10 days, at the same time. It is not independent becuase you check at same time every day.

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Independent:

Turn on the radio and record if it is playing music or not. repeat this every 10 minutes for 24 hours.

Select a random time in a (24-hour) day; and turn on the radio and record if it is playing music or not.

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