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Why does an observational study have a greater risk of selection bias than an experimental study?
Same-Sex Couples
Romantic partnerships between two individuals of the same sex or gender identity.
Heterosexual Counterparts
Individuals or counterparts of the opposite sex in the context of heterosexual relationships or comparisons.
Lesbian Mothers
Women who identify as lesbians and are mothers, either through biological means, adoption, or as step-parents.
Median Age
A statistic that divides a population into two equal groups, such that half the population is younger than this age and the other half is older.
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