ex0429 {Sleuth2}

Exercise and Walking Time

Description

Can active exercise shorten the time it takes an infant to walk alone? Twelve, one week old, male infants from white, middle-class families were randomly allocated to one of two treatment groups. Those in the active-exercise group received stimulation of the walking reflexes during four 3 minute sessions each day from the beginning of the second through the end of the eighth week. Those in the other group received no stimulation.

Usage

ex0429

Format

A data frame with 12 observations on the following 2 variables.

Age

age (months) at which infants first walked alone

Exercise

a factor with levels "Active" and "None"

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

References

Zelazo, P.R. (1972). Walking in the Newborn, Science 176: 314–315.

Examples

str(ex0429)