Question 2 (2 points) Birth Month January May September 33.83 Average Crawling A

Question

Question 2 (2 points) Birth Month January May September 33.83 Average Crawling Age 29.84 28.58 SD 7.08 8.07 6.93 32 27 38 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 age (in weeks) at whiclh 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. The data are for January, May, and September Crawling age is given in weeks. Assume that data are three independent SRSs, one from each of the three populations (babies born in a particular month), and that the populations of crawling ages have Normal distributions. The overall mean response is Select one O 30.75 7.30 31.05

Explanation / Answer

The overall mean is 30.75 (a).

There is not enough information to tell. Side by side box plot of the groups are required.

1.36/df(day)=0.68, df(day)=1.36/0.68=2 (option 4)

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