33. The purpose of a study by Roodenburg et al. (A-31) was the classification and quantitative description of various fetal movement patterns during the second half of pregnancy.

The following are the number of incidents of general fetal movements per hour experienced by nine pregnant women at four-week intervals. May we conclude from these data that the average number of general movements per hour differs among the time periods? Let a = .05.

Patient Weeks of Gestation No. 20 24 28 32 36 1 66 57 52 37 40 2 47 65 44 34 24 3 57 63 57 34 10 4 39 49 58 27 26 5 54 46 54 22 35 6 53 62 45 37 40 7 96 46 64 43 41 8 60 47 50 62 26 9 63 47 44 42 39