Question

current attempt in progress
when two variables are correlated but there is no cause-and-effect relationship between them, this is called

the placebo effect
the third variable problem
a demand characteristic
a cohort effect

Explanation:

• The placebo effect is about a fake treatment having an effect due to belief, not about variable correlation without causation.
• The third variable problem occurs when two variables are correlated because a third, unmeasured variable influences both, meaning there's no direct cause - effect between the two original variables.
• A demand characteristic is about participants changing behavior based on perceived study demands, not related to variable correlation.
• A cohort effect is about differences due to being part of a particular group (like age cohort), not about variable correlation without causation.

Answer:

B. the third variable problem