A graduate student believes that people consider faces with more contrast between lip color and skin tone as more feminine. He identifies the null and alternative hypotheses as:

The level of contrast between lip color and skin tone does not affect how feminine a face is considered.

Explanation:

From the excerpt:

‘A graduate student believes that people consider faces with more contrast between lip color and skin tone as more feminine’ . This is considered as a null and alternative hypotheses.

This is because there is no relationship between how feminine a face is considered to level of contrast between lip color and skin tone and zero effects.

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