A Researcher Is Examining Whether the Amount of Time Newborns

Multiple Choice

A researcher is examining whether the amount of time newborns can sleep without being disturbed is related to parental stress. The researcher asked 30 parents to report the longest amount of time in number of minutes their newborn child has been able to sleep without waking up. Then the parents were asked to rate their stress levels.
How many degrees of freedom are there for this correlation?

A) 30
B) 29
C) 27
D) 28