At What Age Do Babies Learn to Crawl? Does It

question 23

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.What is the value of the Kruskal-Wallis statistic H for these data?

• A)H = 2.77
• B)H = 3.10
• C)H = 3.76
• D)H = 5.99

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Definitions:

Equilibrium Quantity

The amount of products or services available and sought after at the equilibrium price, where the supply meets the demand.

Price Floor

A government or regulatory-imposed minimum price for goods or services, intended to prevent prices from dropping too low.

Shortage

A circumstance in which the market desire for a service or product is greater than the supply.

Surplus

The situation in which the quantity supplied of a product exceeds the quantity demanded, often leading to price decreases.