An article titled "Buying Time Promotes Happiness" reports that 36% of working Americans spend money on timesaving services each month. What condition on how the data were collected would make it reasonable to generalize
this result to the population of all working Americans?
(a) The sample must include an equal number of participants from each state who are working Americans.
(b) The sample must be randomly selected from the population of all working Americans.
(c) The sample must be randomly selected from the population of all working Americans who use time-saving
services.
(d) The sample must be randomly selected from the population of all Americans regardless of employment
status.
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(b) The sample must be randomly selected from the population of all working Americans.
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