A researcher was interested in the impact of different types of day care on children€™s development. She obtained samples of children who (a) Had been watched by a babysitter at home; (b) Had attended small, home-based day care; or (c) Had gone to a large day-care center. She also classified the children as having received paid care for (1) Less than 40 hours a week or (2) 40 or more hours per week.

There were eight children in each cell and no siblings were included. She measured each child€™s adjustment level, on an interval scale, in the first grade. Below are the means (and standard deviations).

a. Evaluate all four assumptions and

b. Decide if it is OK to proceed with the test.

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Small Day Large Day Care Babysitter Care 108.28 <40 112.66 106.80 hours (14.83) (16.76) (17.65) >40 114.88 108.71 109.28 hours (13.12) (15.66) (16.77)