Statıstıcs I Deneme Sınavı Sorusu #854270
A researcher wants to investigate the effects of tea on heart diseases. What should the researcher do in order to conclude a causal effect?
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Ask a sample if they have a heart disease and how much tea they drink a day |
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Ask the patients with heart problems whether they are drinking tea |
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Give tea to a sample and observe what they are doing |
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Conduct an experiment with control and treatment groups |
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Survey a sample about their beliefs on the effect of tea on heart diseases |
Yanıt Açıklaması:
In order to prove whether tea has an effect on heart diseases, an experiment needs to be conducted where conditions are controlled.
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