This data set contains the ages at which 12 infants were reported to have started walking by their mothers. The infants were randomly split into "exercise" and "no-exercise" groups" as part of the study conducted by Zelazo et al. (1972). This data is displayed in Table 9.8 of Wolfe and Schneider - Intuitive Introductory Statistics.
data.frame with 6 rows and 2 columns indicating the age (in months) at which infants first walked for the exercise and no-exercise groups.
Zelazo et al. (1972)
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