Three companies are trying to sell you their additives to reduce waste in a chemical manufacturing process.

Question:

Three companies are trying to sell you their additives to reduce waste in a chemical manufacturing process. You€™re not sure their products are appropriate because your process is different from the industry standard (it€™s a proprietary trade secret). You have arranged to get a small supply of each additive, provided free, for testing purposes. Table 15.5.2 shows the summaries of the waste measurements when each additive was used, all else kept equal.
a. Which additive appears to leave the highest amount of waste? Which appears to leave the lowest?
b. Find the total sample size, n, the grand average, X, and the number of samples, k.
c. Find the between-sample variability and its degrees of freedom.
d. Find the within-sample variability and its degrees of freedom.