Question
es are often bundled in clothes that restrict their movement? Data were collected from parents who brought their babies into the University of Denver 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: age do babies learn to crawl? Does it take longer to learn in the winter when babi Infant Study Center Crawling age Birth month Mean January May September 33.83 St. dev. n 7.08 8.07 6.93 38 29.84 28.58 32 27 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. Source Sum of squares DF Mean square Groups Error Total 505.26 53.45 What are the degrees of freedom for the error term? A) 2 B) 3 C) 94 D) 96
Explanation / Answer
The ANOVA table is as shown below: -
DF for error term = C) 94
Source SS DF MS F Groups 505.26 2 252.63 4.72647334 Error 5024.3 94 53.45 Total 5529.56 96
