Question: Hi, need help for this Question: Some scientists have found that drinking coffee is associated with students' ability to sleep (enough vs not enough sleep).

Hi, need help for this Question:

Some scientists have found that drinking coffee is associated with students' ability to sleep (enough vs not enough sleep).

Sex was a confounder. This means that:

Statement (I): Percentage of coffee drinkers among males is different from the percentage of coffee drinkers among females.

Statement (II): Percentage of males among coffee drinkers is different from the percentage of females among coffee drinkers.

Statement (III): Percentage of males among students who have enough sleep is different from the percentage of males among students who do not have enough sleep.

Which of the above statement is correct ? and why ?

Hint: there can be more than 1 correct statements.

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