In a study, 320 full term infants were examined at their 4-month checkups for various development milestones. The baby’s predominant sleep position – either prone (on the stomach) or supine (on the back) or side – was determined. The sample results are below. The researcher reported that infants who slept in the side or supine position were less likely to achieve a given milestone (rolling over) that the infants who slept in the prone position. Test the claim of the researcher at the 1% level.   prone supine or side number of infants 121 199 number that roll over 93 119

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