An engineer measures the peak current (in microamps) when a solution containing an amount of nickel (in parts per 106 ) is added to a buffer. The experiment was repeated for eleven different values of nickel solutions. A scatterplot showing the data is given below: Suppose a regression line was added to the plot above. If an additional measurement had been taken with the nickel of 62 parts per 106 and a peak current of 0.38 microamps, adding this observation would: A. decrease the intercept, decrease the slope. B. decrease the intercept, increase the slope. C. increase the intercept, increase the slope. D. increase the intercept, decrease the slope.

A slope indicates the steepness of a line while the intercept points the location where it intercepts its axis. The linear relationship between can be defined using the intercept and the slope. Both concepts are used to estimate the average range of change. Since we are trying to add a peak current value of 0.38 which is lesser than the average, the intercept of the graph would therefore decrease and the slope increase.