A researcher records the amount of time (in minutes) that parent-child pairs spent on social networking sites to test whether they show any generational differences. From the following findings reported in APA format, interpret these results.
Parents spent significantly less time on social networking sites compared to their children
(MD = 42 minutes),

t(19) = 3.718,

p < 0.05,

d = 0.73.
State the sample size.