Conductivity is one important characteristic of glass. The article “Structure and Properties of Rapidly Quenched Li2O-Al2ONb2O5 Glasses” (J. of the Amer. Ceramic Soc., 1983: 890–892)

202.88 sYˆ 5 .1141 x 5 100 bˆ

2 5 2.00163141, sbˆ

2 5 .00003391, SSE 5 .29, SST 5 bˆ

0 5 21.5127, bˆ

1 5 .391901, y 5 output x 5 frequency (MHz)

1 .297ef 2 .0102(

reports the accompanying data on content of a certain type of glass and at 500 K.
x 19 20 24 27 29 30 y x 31 39 40 43 45 50 y (This is a subset of the data that appeared in the article.)
Propose a suitable model for relating y to x, estimate the model parameters, and predict conductivity when Li2O content is 35.