"The number of words in a child's vocabulary is a function of the child's age. A typical child at the age of 20 months has a vocabulary of 300 words. At the age of 50 months, the child's vocabulary has increased to 2,100 words. " On your own, graph the pairs of points generated from the last two sentences, where the age is the independent variable and the vocabulary is the dependent variable. Now, as a group, discuss how many words a 30-month old child would know? How many words would a 40-month old child know? What assumptions are you making when you give these estimates? How many words would you predict a typical child learn each month from the age of 20 months to the age of 50 months? Could a graph be used to estimate how many words a 10-month old child knows? Explain.
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