A horticulturist is studying the relationship between tomato plant height and fertilizer amount. Thirty tomato plants grown in similar conditions were subjected to various amounts of fertilizer over a four-month period, and then their heights were measured. A portion of the data is shown in the accompanying table.

Tomato Plant Height (inches)Fertilizer Amount (ounces)

20.4.......................................................1.9

49.2.......................................................5.0

⋮..............................................................⋮

46.4.......................................................3.1

a. Use Excel to estimate the regression model: Height = β0 + β1 Fertilizer + ε.

b. Interpret the coefficient of Fertilizer. Does the y-intercept make practical sense?