12.10 A Chemical Experiment Using a chemical procedure called differential pulse polarography, a chemist measured the peak current generated (in microamperes) when a solution containing a given amount of nickel (in parts per billion) is added to a buffer:

a. Use the data entry method for your calculator to calculate the preliminary sums of squares and cross-products, S., Syy, and Sxy-

b. Calculate the least-squares regression line.

c. Plot the points and the fitted line. Does the assumption of a linear relationship appear to be reasonable?

d. Use the regression line to predict the peak current generated when a solution containing 100 ppb of nickel is added to the buffer.

e. Construct the ANOVA table for the linear regression.

Transcribed Image Text:

x = Ni (ppb) y=Peak Current (mA) 19.1 0.095 38.2 0.174 57.3 0.256 76.2 0.348 95 0.429 114 0.500 131 0.580 150 0.651 170 0.722