Exercise

# Syntax from math

The `babies`

data set contains observations about the birthweight and other characteristics of children born in the San Francisco Bay area from 1960--1967.

We would like to build a model for birthweight as a function of the mother's age and whether this child was her first (`parity == 0`

). Use the mathematical specification below to code the model in R.

$$ birthweight = \beta_0 + \beta_1 \cdot age + \beta_2 \cdot parity + \epsilon $$

Instructions

**100 XP**

The birthweight variable is recorded in the column `bwt`

.

- Use
`lm()`

to build the parallel slopes model specified above. It's not necessary to use`factor()`

in this case as the variable`parity`

is coded using binary numeric values.