Answer :
The current proportion of babies born to unmarried parents.
Given that,
In the United States, newborns born to unmarried parents make up more than half of all births. We are interested in learning if this ratio is rising. How should the population parameter be defined?
To find : Define the population parameter that interest ?
The present proportion of children born to unmarried parents should be our population parameter of interest since we want to know if the proportion is rising.
Our population parameter of interest should be the current proportion of children born to unmarried parents since we want to know if the proportion is increasing.
Therefore, the current percentage of children born to unmarried parents option (a) is right.
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