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 age (in weeks) at which their child was first able to creep or crawl a distance of four feet within one minute. The researchers planned to use least-squares regression to see if the age at which a baby was first able to crawl would be predicted from the average outdoor temperature six months after the baby's birth date. The explanatory variable in this study is

A. the average outdoor temperature six months after a baby's birth date.

B. the age (in weeks) at which a baby was first able to creep or crawl a distance of four feet within one minute.

c.the extent to which parents honestly reported the age at which their baby was first able to crawl and didn't exaggerate in order to make their baby appear gifted.

Explanation / Answer

Explanatory variables are those variables which are responsible in explaining the variability of response variable. So these variables are kind of independent variables.

Here our objective is to study at what age babies learn to crawl. We want to study whether the average outdoor temperature has got something to do with the age at which a baby first able to crawl. So here the outdoor temperature is independent variable and babies' crawling age is dependent variable/response variable.

So, the average outdoor temperature six months after a baby's birth date is explanatory variable in this study.

So Option (A) is the correct choice.

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