5. Baby’s Sleeping Position II The researchers in Exercise 4 also measured several other developmental milestones and their relationship to the infant’s predominant sleep position.15 The results of their research are presented in the table for the 320 infants at their 4-month checkup.

a. What experimental design(s) were used by the researchers?

b. What hypotheses were of interest to the researchers, and what statistical test would the researchers have used?

c. Explain the conclusions that can be drawn from the three p-values in the last column of the table and the practical implications that can be drawn from the statistical results.

d. Have any statistical assumptions been violated?

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Milestone Side or Score Stomach Back P Pulls to sit with no head lag Pass 79 144