1. Help for Insomniacs. In Exercise 1.23, we learned of a study to determine whether just one session of cognitive behavioral therapy can help people with insomnia. In the
study, forty people who had been diagnosed with insomnia were randomly divided into
two groups of 20 eacht People in one group received a one-hour cognitive-behavioral
therapy session while those in the other group received no treatment. Three months
later, 14 of those in the therapy group reported sleep improvements while only 3 people
in the other group reported improvements.
(a) Create a two-way table of the data. Include row and column labels, as well as totals
across and down. Reineived
che - hor rentment
total
(it
1
ve
total
(b) How many of the 40 people in the study reported sleep improvements?