Who says "I love you" first? A recent study asked 47 heterosexual couples which person (the male or female) was the first to say "I love you." Each couple is one case in the dataset, and the only variable recorded is the gender of the person who first said "I love you." Researchers hypothesized that males were more likely to say the words first.

What type of parameter is being studied in this scenario?

p (population proportion)

p1-p2(difference in population proportions)

1-2(difference in population means)

(population mean)

1(population slope)