STAT368 Lecture Notes - Box Plot, European Credit Transfer And Accumulation System
5 Apr 2014
School
Department
Course
Professor
Document Summary
Example: a hardness testing machine presses a pointed rod (the tip ) into a metal specimen (a. The depth of the depression is a measure of the hardness of the specimen. It is feared that, depending on the kind of tip used, the machine might give di erent readings. The experimenter wants 4 observa- tions on each of the 4 types of tips. Note that the di erences in readings might also depend on which type of metal specimen is used, i. e. on the coupons. A completely randomized design would use 16 coupons, making 1 depression in each. The coupons would be randomly assigned to the tips, hoping that this would average out any di erences between the coupons. Nuisance factor - it may a ect the readings, but we aren t very interested in measuring its e ect. It is also controllable, by blocking: we can use. 4 coupons (the blocks ) and apply each of the.
