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 $), and her independent variable is annual household income (in $1,000). Regression analysis of the data yielded the following tables:
Coefficients
Standard Error
t Statistic
p-value
Intercept
3.996
1.161268
3.441065
0.004885
x
0.358
0.102397
3.496205
0.004413
Source
df
SS
MS
F
Regression
1
9.858769
9.858769
12.22345
Se = 0.898
Residual
11
8.872
0.806545
r2 = 0.526341
Total
12
18.73077
Abby's sample size (n) is __________.
11
12
20
10
8