High daily temperatures and coffee sales (in hundreds ofdollars) were recorded at a local Starbucks for eight randomlyselected days. Results are listed in the table below. Is here acorrelation between temperature and coffee sales? Use ?=.05. Whatis the best predicted sales total for a day with a high temperatureof 60° F?
x(° F) 32 39 51 60 65 72 78 81
y(hundreds of dollars) 26.2 24.8 19.7 20.0 13.3 13.9 11.4 11.2
r:
critical value:
Significant linear correlation? Yes or No?
Regression equation:
Best predicted time on 60° day:
What proportion of variation in sales is due to temperature?
