Question: Ten pairs of individuals, matched as carefully as possible in terms of age, sex, education, and IQ, have been exposed either to a sedative or to a placebo in the form of a cookie. After 30 minutes, each subject is tested on a simple task of requiring the crossing out of all the letters a on a sheet of paper containing a random assortment of letters. The number of errors (letters not crossed out) made by each subject in a 2-minute test is given below. Is there a significant difference in the mean number of errors between the two groups? Use \(\alpha \) = .05.