A company conducted an experiment to investigate the effects of three different processes on the strength of its steel. The investigators randomly divided the production of 120 batches of steel, using 40 batches for each process. The steel was rated on a scale of 0 to 100 for its strength. The following sample means and standard deviations were obtained. 
The degrees of freedom for the F test are:
Definitions:
Real Cigarette
Refers to traditional tobacco cigarettes, as opposed to electronic cigarettes or other smoking alternatives.
Control Group
In experimental research, a group of subjects that does not receive the experimental treatment and is used as a benchmark to measure the effects of the treatment.
Sugar Pills
Placebo tablets made of inert ingredients, used in medical trials to examine the effect of treatments without drug involvement.
ADHD
Attention Deficit Hyperactivity Disorder, a behavioral condition characterized by inattention, hyperactivity, and impulsivity.
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