Which question cannot be tested with a scientific investigation? adrian is a researcher who works in a lab. he decides to perform an experiment to understand the side effects and benefits of drinking tea. he puts forth some questions about the experiment. they include, { do people who drink tea have a higher risk of brain illnesses than non-tea drinkers? } and [ do people who drink tea stay more alert than non-tea drinkers? ] he also proposes a question, [ are people who drink tea happier than people who don’t drink tea? ]