Questions from Engineering Statistics

Q: Consider the aggregate data of Example 13.1. Perform Bartlett’s

Consider the aggregate data of Example 13.1. Perform Bartlett’s test, at level α = 0.1, to determine if there is heterogeneity of variance among the aggregates.

Q: Three catalysts are used in a chemical process; a control (

Three catalysts are used in a chemical process; a control (no catalyst) is also included. The following are yield data from the process: Use Dunnett’s test at the α...

Q: Four laboratories are being used to perform chemical analysis. Samples of

Four laboratories are being used to perform chemical analysis. Samples of the same material are sent to the laboratories for analysis as part of a study to determine whether or not they give, on the a...

Q: The following data represent the operating times in hours for three types

The following data represent the operating times in hours for three types of scientific pocket calculators before a recharge is required: Use the Kruskal-Wallis test, at the 0.01 level of significan...

Q: An experiment was designed for personnel in the Department of Animal Science

An experiment was designed for personnel in the Department of Animal Science at Virginia Tech to study urea and aqueous ammonia treatment of wheat straw. The purpose was to improve nutritional value f...

Q: To determine which muscles need to be subjected to a conditioning program

To determine which muscles need to be subjected to a conditioning program in order to improve one’s performance on the flat serve used in tennis, a study was conducted by the Departm...

Q: An experiment was conducted to determine whether additives increase the adhesiveness of

An experiment was conducted to determine whether additives increase the adhesiveness of rubber products. Sixteen products were made with the new additive and another 16 without the new additive. The o...

Q: The extraction rate of a certain polymer is known to depend on

The extraction rate of a certain polymer is known to depend on the reaction temperature and the amount of catalyst used. An experiment was conducted at four levels of temperature and five levels of th...

Q: In Myers, Montgomery, and Anderson-Cook (2009),

In Myers, Montgomery, and Anderson-Cook (2009), a scenario is discussed involving an auto bumper plating process. The response is the thickness of the material. Factors that may impact the thickness i...

Q: An engineer is interested in the effects of cutting speed and tool

An engineer is interested in the effects of cutting speed and tool geometry on the life in hours of a machine tool. Two cutting speeds and two different geometries are used. Three experimental tests a...