Question

Q: It is known that in a chemical process the purity of oxygen is related to the percentage hydrocarbons
that are present in the main condenser. The purity of the oxygen in percent was measured in 20
hydrocarbon levels and the following regression summary information were obtained:
S_xx = 0.68
S_xy = 10.18
S_yy = 173.37
where the fitted equation is Y = 75.20 + 14.97X. Based on this,

a. Compute and interpret the correlation coefficient.

b. test significance of the regression slope with a significance level of 1%.

Answer 1