Answer
$s_e=0.494$
Work Step by Step
$ŷ =1.390x+1.11$
$s_e=\sqrt {\frac{Σ(y_i-ŷ_i)^2}{n-2}}=\sqrt {\frac{[36.05-(1.390\times24.80+1.11)]^2+[35.57-(1.390\times24.59+1.11)]^2+[35.57-(1.390\times24.59+1.11)]^2+[34.58-(1.390\times24.29+1.11)]^2+[34.20-(1.390\times23.81+1.11)]^2+[34.73-(1.390\times24.87+1.11)]^2+[37.38-(1.390\times25.90+1.11)]^2+[37.96-(1.390\times26.11+1.11)]^2+[37.46-(1.390\times26.63+1.11)]^2+[37.75-(1.390\times26.31+1.11)]^2+[38.50-(1.390\times26.84+1.11)]^2}{11-2}}=0.494$
