In an experiment in which 194 people who had lost a least 10% of their body weight in a medical weight loss program were assigned at random to one of...

In an experiment in which 194 people who had lost a least 10% of their body weight in a medical weight loss program were assigned at random to one of three groups for follow-up. One group met monthly in person, one group "met" online monthly in a chat room and one group received a monthly newsletter by e-mail. After 18 months, participants in each follow-up group were classified according to whether or not they had regained more than 3 kilograms, resulting in the data given in the table below.

                                                                                                                                                     Weight regained

                                                                                                 Regained 3kg or less                            regained more than 3kg

Follow-up method           In-Person     Observed                                 52                                                                45

                                                             expected                                  39.5                                                               57.5

                                       newsletter     observed                                 27                                                                   70

                                                              expected                                 39.5                                                                57.5

1. Calculate the chi-square test statistic. Report to 2 decimals correctly.
2. Report the critical value. Use a 1% level of significance.
3.  You conclude that there is an association between the amount of weight regained and the follow-up method. True/False