Question

Data were collected on the weight, in ounces, of puppies for the first three months after birth. A line of fit was drawn through the scatter plot and had the equation w = 4.25 + 0.4d, where w is the weight of the puppy in ounces and d is the age of the puppy in days.

What is the w-intercept of the line of fit and its meaning in terms of the scenario?

0.4; a puppy who is just born is predicted to weight 0.4 ounces
0.4; for each additional day after the puppy is born, its weight is predicted to increase by 0.4 ounces
4.25; for each additional day after the puppy is born, its weight is predicted to increase by 4.25 ounces
4.25; a puppy who is just born is predicted to weigh 4.25 ounces

Answer 1

(d) 4.25; a puppy who is just born is predicted to weigh 4.25 ounces

Explanation:

You want the w-intercept and its meaning in the equation w = 4.25 +0.4d, which represents a puppy's weight when it is d days old.

W-intercept

The w-intercept is the value of w when d=0. That is ...

w = 4.25 +0.4·0 = 4.25

It represents the weight of the puppy when it is 0 days old.

The w-intercept is 4.25; a puppy who is just born is predicted to weigh 4.25 ounces, choice D.

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