A study involving x = temperature (Celsius) and y = milk pH reported the following results: x 4 4 24 24 25 38 38 40 45 50 55 56 60 67 70 78
y 6.85 6.79 6.63 6.65 6.72 6.62 6.57 6.52 6.50 6.48 6.42 6.41 6.38 6.34 6.32 6.34
Do these data suggest that there is a useful linear relationship between temperature and pH? State and test the relevant hypotheses using a significance level of 0.05.