A chemical company wished to study the consistency of the strength of one of its

Question

A chemical company wished to study the consistency of the strength of one of its liquid chemical products. The product is made in batches in large vats and then is barreled. The barrels are subsequently stored for a period of time in a warehouse. To examine the consistency, of the strength of the chemical, an analyst randomly selected five different batches of the product from the warehouse and then selected four barrels per batch at random. Three determinations per barrel were made. a. Is this study purely experimental or observational or mixture of both? Why? b. Identify all factors, factor levels, and factor-level combinations. c. What type of study design is being implemented here? d. What is the basic unit of study? A chemical company wished to study the consistency of the strength of one of its liquid chemical products. The product is made in batches in large vats and then is barreled. The barrels are subsequently stored for a period of time in a warehouse. To examine the consistency, of the strength of the chemical, an analyst randomly selected five different batches of the product from the warehouse and then selected four barrels per batch at random. Three determinations per barrel were made. a. Is this study purely experimental or observational or mixture of both? Why? b. Identify all factors, factor levels, and factor-level combinations. c. What type of study design is being implemented here? d. What is the basic unit of study? a. Is this study purely experimental or observational or mixture of both? Why? b. Identify all factors, factor levels, and factor-level combinations. c. What type of study design is being implemented here? d. What is the basic unit of study?

Explanation / Answer

a) It is a mixture of both....batches are observational factor.....procedure performed in batch is experimental(as all of them might not have the exact same processing conditions)

b) Factor being studied is the consistency of strength of the chemical. Details about the factor levels are not given.

c) Blocked design

d) Unit is each of the determinations per barrel that were made

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