Problem Sets

• Statistical Methods - STAT 581 - Exam 1

  An experiment is conducted to study the effect of fitness level on ego > strength. Random samples of college faculty members are selected from each

• Statistical Methods - STAT 581 - Exam 2

  A randomized complete block design is used to study the effect of caliper on the measured diameters

• Statistical Methods - STAT 581 - Problem Set 1

  An experiment is designed to investigate whether the time to drill holes in rock holes using wet or dry drilling.

• Statistical Methods - STAT 581 - Problem Set 2

  A product developer is investigating the tensile strength of a new synthetic fiber that will be used to make cloth for men’s shirts.

• Statistical Methods - STAT 581 - Problem Set 3 a

  An experiment is conducted to study the effect of drilling method on drilling time. Each method (dry drilling, wet drilling) is used on $n = 12$ rocks.

• Statistical Methods - STAT 581 - Problem Set 3 b

  An experiment to compare a new drug to a standard is in the planning stages. The response variable of interest is the clotting time (in minutes) of blood

• Statistical Methods - STAT 581 - Problem Set 4

  The insulating life of protective fluids at an accelerated load is being studied. The experiment has been performed for four types of fluids, with $n = 5$

• Statistical Methods - STAT 581 - Problem Set 5

  A factorial experiment is used to develop a nitride etch process on a single wafer plasma etching tool.

• Statistical Methods - STAT 581 - Problem Set 6

  A soft drink bottler is interested in studying the effects on a filling process. A factorial experiment is run using three factors: percent carbonation (in %),

• Statistical Methods - STAT 581 - Problem Set 7

  A paired comparisons design is used to study the effect of machine operator on > the measured running time (in secs.) of a fuse. A sample of $n = 10$ fuses is

• Statistical Methods - STAT 581 - Problem Set 8

  An experiment is designed to test for systematic differences in the hardness > measurements provided by two devices (fixed effect, factor $A$).

• Statistical Methods - STAT 581 - Problem Set 9

  The surface finish of metal parts made on $a=4$ machines is under > investigation. > Each machine can be run by one of $b=3$ operators.