Abby Kratz, a market specialist at the market research firm of Saez, Sikes, and Spitz, is analyzing household budget data collected by her firm. Abby's dependent variable is monthly household expenditures on groceries (in $'s), and her independent variable is annual household income (in $1,000's). Regression analysis of the data yielded the following tables.

Coefficients

Standard Error

tStatistic

p-value

Intercept

3.9961.1612683.4410650.004885x

0.3580.1023973.4962050.004413

Sourcedf

SS

MS

F

Regression

19.8587699.85876912.22345Se= 0.898

Residual

118.8720.806545r2= 0.526341

Total

1218.73077

Abby's sample size (n) is __________.

11

12

20

10

8