# Types of statistical studies

Determines if a statistical study is a sample study, an experiment, or an observational study.

### Problem

Tomer is a zoologist with a hypothesis:
There is a negative linear (or almost linear) association between the average heart rate of a mammal species and the species' average life span.
Tomer conducted a study to test his hypothesis:
He gathered data about the average heart rate (in BPM - Beats Per Minute) and average life expectancy (in years) of hamsters, chipmunks, rabbits, cats, pigs, and horses. He obtained the following scatter plot, which is almost linear:
space
What can be said about the methods used in Tomer's study?
Select all that apply.
Select all that apply.
Is the study appropriate for the statistical questions it's supposed to answer?
Please choose from one of the following options.