At What Age Do Babies Learn to Crawl? Does It

question 17

Multiple Choice

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. The data are to be analyzed with the Kruskal-Wallis test.Under the null hypothesis,what is the approximate distribution of H?

• A)F(2,6)
• B)N(  ,  )
• C)  (2)
• D)  (3)

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Definitions:

Demand Schedule

A table or graph showing the quantity of a product or service that consumers are willing and able to purchase at various prices.

Economic Profit

The total revenue of a business minus its explicit and implicit costs, representing the profit beyond the next best alternative use of resources.

Specific Firm

Refers to a particular company or business entity distinct from others in its industry or sector.

Demand Curve Elasticity

A measure of how much the quantity demanded of a good responds to a change in its price, indicating its sensitivity.