Some babies start walking well before they are a year old, while others haven't taken their first unassisted steps at 18 months or even later. The data below is from an experiment designed to see whether a program of special exercises for 12 minutes each day could speed up the process of learning to walk. Twelve week-old male infants were randomly assigned to either the special exercise groups or to the control group. The age (in months) when the infant first walked without support was recorded. Special Exercises Exercise Control Construct a 98% confidence interval estimate of the difference between waling times for the special exercises group and the exercise control group if all babies could have had each treatment. 9. 9.5 9.75 10 13 9.5 11 10 10 11.75 10.5 15

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