Macrophytes Were Sampled at Each of 3 Depths in a Particular

question 17

Short Answer

Macrophytes were sampled at each of 3 depths in a particular region of Lake Opinicon. The macrophages
obtained at each depth were classified as to their genus and their dry weights were also determined. One
question that was studied was whether or not macrophyte dry weight differs at different depths and if the
dry weight depended on the type of macrophage. The number of explanatory variables in this part of the
study is ___________.
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Definitions:

Modus Tollens (MT)

A logical argument form where the denial of the consequent leads to the denial of the antecedent, often structured as "If P, then Q. Not Q, therefore not P."

Disjunctive Syllogism (DS)

A form of logical argument where, from two disjunct statements, the denial of one leads to the affirmation of the other.

Constructive Dilemma (CD)

A form of argument where, given premises that jointly imply two conclusions, if one of them is true, then so is the other.

Atomic Sentences

Simple statements in logic that contain no logical connectives or quantifiers, expressing a basic claim.