Typo pag.160

[OrlandiMartina]

Pag.160 of the book "Statistical Science"
Replace the word: sesonality
with seasonality

[MarcoRianiUNIPR]

I have decided to group these typo as follows

However, no need to say that these 3 typos coun (1/3)*3 = +1 to your final mark

@OrlandiMartina thank you very much for your careful reading