Hi guys

Please see my question about fitting an ANOVA table. I presume this model will be fitted by

I've started doing some work, by taking the logs of all the prices, and finding the means:

Please find attached the excel spreadsheet containing all the data and what i've done so far.

regression question excel.xls

I'm confused in the sense, what do I have to x and y. I only have values for 2 years of tyres.

I would greatly appreciate any assistance on this,

Many thanks