At what age do babies learn to crawl? Does it take longer to learn in the winter

Question

At what age do babies learn to crawl? Does it take longer to learn in the winter when babies are often bundled in clothes that restrict their movement? Data were collected from parents who brought their babies into the University of Denver Infant Study Center to participate in one of a number of experiments between 1988 and 1991. Parents reported the birth month and the age at which their child was first able to creep or crawl a distance of four feet within one minute. The resulting data were grouped by month of birth: January, May, and September: Crawling age is given in weeks. Assume the data represent three independent simple random samples, one from each of the three populations consisting of babies born in that particular month, and that the populations of crawling ages have Normal distributions. Fill in the table and complete a test to see if the averages of the groups are the same.

Explanation / Answer

Above table contains results from an F-test conducted to see whether there are any differences between groups. The p-value suggests that there is no appreciable difference between the groups.

Source SS df MS F p Between 505.254 2 252.627 4.727 0.011 Within 5,024.087
94 53.448 Total 5,529.341 96

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