Hi,

Could you help me with this question, please? They're also asking for an upper and lower bound for the prediction interval.

\fd) Calculate a prediction interval for the number of items sold when the retailors price is 28 SEK, the competitors price is 31 SEK, the retailor uses special offers and the advertising costs is 2500 SEK (Note: use the value of the independent variable that is relevant for your model). What is the interpretation of this interval