A man in a red shirt is standing next to a woman in a blue dress. They are both holding hands and smiling at each other. Across-study variation refers to the fact that different published studies of the same pollutant/health effect relationship typically do not report identical findings. Can we conclude that this variation refers to studies about a specific pollutant always showing the same results? But tourists beware! The city is known for its pickpockets and scams. Can you trust the locals? Mister Kells, he keeps ledgers over in th' tack room. Therefore, it is unlikely that Mister Kells never keeps a ledger at all.
yes
it is not possible to tell
yes
no