If a child psychologist reports that age in months predicts appetite level for a group of infants using a linear prediction rule in which a = 1 and b = 2,the appetite level for a four-month-old infant is
A)4
B)8
C)9
D)12

Question

Quizplus · Accepted Answer

Using the given linear prediction rule, we have:
appetite level = a + (b x age in months)
Substituting a=1 and b=2, we get:
appetite level = 1 + (2 x age in months)
For a four-month-old infant, the age in months is 4. Substituting this value, we get:
appetite level = 1 + (2 x 4) = 9
Therefore, the appetite level for a four-month-old infant is 9, which corresponds to choice C.

If a Child Psychologist Reports That Age in Months Predicts