Why is the lab technician potentially a confounding variable in the study? What is the best explanation for the answer? Thanks!
Why is the lab technician potentially a confounding variable in the study? What is the best explanation for the answer? Thanks!
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Why is the lab technician potentially a confounding variable in the study? What is the best explanation for the answer? Thanks!

Transcribed Image Text:A researcher wanted to study the effects of a certain chemical on cell growth. The chemical was to be applied at two
different doses, high and low, to two different cell types, strain A and strain B. Each combination of dose and cell
type was to be replicated ten times. To have consistency from one replicate to the next, the researcher decided to use
four lab technicians. One technician would be assigned the high dose with strain A. A second would be assigned the
low dose with strain A. A third would be assigned the high dose with strain B. A fourth would be assigned the low
dose with strain B. The assignment of lab technician to the replicates for a combination of dose and cell type would
be randomized. A statistician told the researcher that the design could be improved by controlling confounding
variables. Which of the following is potentially a confounding variable in this study?
(A) Chemical used
(B) Lab technician
(C) Dose
(D) Cell type
(E) Cell growth
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