A researcher wanted to study the effects of a certain chemical on cel growth. The chemical was to be applied at two different dowsed, high and low, to two different types cell types, strain A and strain B. Each combination of dose and cell type was to be replicated ten times. To have a 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 the strain A. The 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

A confounding variable is a variable capable of influencing both independent and dependent variables. This variable influences both causes and effects.

In this study, the confounding variable is the Lab Technician (Option B).

A dependent variable is a variable that is being tested during an experimental procedure, whereas the independent variable doesn't change and therefore is 'independent' of the other variables in an experiment.

Moreover, the confounding variable influences both the cause (ie.. the independent variable) and its effects (i.e., the dependent variable).

In this case, Lab technicians varied across different treatments, thereby influencing both the chemical/strains used in the experimental procedure (i.e., the independent variables) and the cell growth/doses applied (i.e., the dependent variables).

In conclusion, in this study, the confounding variable is the Lab Technician (Option B).

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