People who spend more money on binoculars tend to know more about birds than people who spend less or none. This observation was almost certainly based on what kind of study? a. Double-blind study b. Correlation c. Anecdote d. Single-blind study

B. Correlation

Explanation:

Correlation study will focus on finding out relationships that exist between different variables. (The relationships could include a causal and effect relationship).

People who spend more money on binoculars tend to spend their time looking at far away objects that cannot be observed by normal eyes (such as behavior). So there is a strong correlation between having expensive binoculars and knowing the behaviors and characteristics of the animal.