State the null and alternative hypotheses.

Do private practice doctors and hospital doctors have the same distribution of working hours? Suppose that a sample of 100 private practice doctors and 150 hospital doctors are selected at random and asked about the number of hours a week they work. The results are shown in Table 11.27.

20-30 30-40 40-50 50-60 Private Practice 16 40 38 6 Hospital 8 44 59 39 Table 11.27