Use the following information to answer questions 49–53. The personnel manager wants to know whether employees strictly follow the rule for their lunch break. He suspects that those who are more senior in the company tend to take a longer lunch. He classifies the employees into three categories according to their seniority in the company. The amounts of lunch time (in minutes) are summarized in the following table. Assume these data do not follow a normal distribution.

Do the data support the hypothesis that group 1 spends less time at lunch than group 2. Do a 5 percent test.

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Time with the company Group 1, less than 1 month Group 2, between 1 and 6 months Group 3, more than 6 months 43 39 42 49 50 39 47 48 39 47 50 55 54 49 51 60 57 55 42 38 63 66 59 55 57 62 53 59 56 78