Background for Questions 7 – 13
In 1905, R.J. Gladstone conducted a study of the relationship between brain weight and size of the head. Brain weight (grams) and head size (cubic cm) measurements were performed for 237 adults. Two categorical variables for Sex (0=male, 1=female) and Age (0=young, 20-46 years old, 1=old, 46+ years old) are available. The linear regression results for regressing brain weight on the head size are summarized below.
One subject in the study has a head size of 3500 cm3 and a brain weight of 1430.86 grams. What is the value of the observed error (residual) for this subject?