8.9. Sarah Hogan collected data on the 'binaural hearing' ability of children with a history of otitis media with effusion (OME). Some of the data (and a description of the problem) are in data frame OME. Fit a suitable non-linear model, and assess if there is a change in ability with age and OME status.

(a) The suggested model is a logistic curve that ranges from 0.5 at low noise levels (when the response is effectively a guess) to 1.0 at high noise levels.