## Part (a) 5 points

Fit an appropriate model for FEV and find a 95% CI for the average volume of air expelled in 1 second for a non smoking male child.

## Part (b) 5 points Does this average significantly change if the height of the child is higher than the average height of children? Explain. ## Part (c) 5 points

Suppose you fit a linear model for FEV against all covariates provided in the data set. Do you see a reason to doubt the assumption of (i) normality (ii) equal variance and (iii) linearity against the covariate Age? Explain. I need help with creating R code

Please use FEV.DAT.text on the companion site