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 4 feet within 1 minute. The resulting data were grouped by month of birth: January, May, and September: Crawling ageBirth monthMeanSt.dev.nJanuary29.847.0832May28.588.0727September33.836.9338 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. A partial ANOVA table is given below . SourceSum of squaresDFMean square FGroups505.26Error53.45Total What are the degrees of freedom for the groups term?

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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 4 feet within 1 minute. The resulting data were grouped by month of birth: January, May, and September:  Crawling ageBirth monthMeanSt.dev.nJanuary29.847.0832May28.588.0727September33.836.9338  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. A partial ANOVA table is given below  . SourceSum of squaresDFMean square FGroups505.26Error53.45Total  What are the degrees of freedom for the groups term?

pattererX · Accepted Answer

Given: Groups represent the birth month. k represent the groups. k=3 The degrees of freedom for the groups term is obtained as below: dfgroups=k−1  =3−1  =2 Thus, the degrees of freedom for the groups term is 2.

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

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