The interstitial nucleus, a subregion of the brain's hypothalamus, is typically smaller for male cats than for female cats. █ ██████████████ █████████ █████████ ██ ████ ████ ███ ████ ████ ███████ ██ █ ███████ █████████ ██ ████ ████ ███ ███████ ██ ████ █████ ███ █████ ████ █████ ████ ████ ███ ████████████ ██████ ████ ████ ██ █████ ██ █████ █████████ █████ ██ ██████ █████ █████ ███ ████ ██ ███ ████████████ ███████ ██████████ ███████ ██ ███ ████ ████ ███ ████████ ███████ ██
The author hypothesizes that the size of the interstitial nucleas determine whether a male cat can contract disease X. This is based on data showing that male cats who died from disease X have larger interstitial nuclei than those male cats that didn’t die from disease X.
The author assumes that the correlation observed between the size of the interstitial nucleus in male cats and death from disease X must be explained by the size of the interstitial nucleus having a causal impact on the presence of disease X.
Which one of the following ███████████ ██ █████ ████ █████████ ███████ ███ █████████
No female cats ████ ████ █████ ██ ████████ ███████ ██ █████ ██ █ ███████ ██ ███████ ██
Many male cats ███ ████████ ███████ █ ████ ████████ ███████ ██ ███ █████ ██ █████ ██ ████████
The interstitial nuclei ██ ██████ ████ ███ ████████ ███████ █ ███ ██████ ████ █████ ██ ██████ ████ ███ ██ ███ ████████ ███████ ██
Of 1,000 autopsies ██ ████ ████ ███ ███ ███ ████████ ███████ ██ █ ████████ ████████████ ██████ ██████ ████ █████ ██ ███ ███████ ████ ████
The hypothalamus is █████ ███ ██ ██ ████████ ██████ ██ ███████ ██ ███ ███████ █ ██ █ ███████ ██ ███████ ██