The report did not account, for the fact that many people had stopped answering the survey, so the results were incomplete., The teacher found a correlation, between the number of hours students studied and their test results: those who studied more often got higher marks., The researchers wanted to establish a causal, relationship, so they tested whether giving students more sleep actually improved their memory., The newspaper reached a misleading, conclusion when it said that coffee made people happier, based on a survey of just ten people., The scientist told her team to interpret the results, with caution because the study included only people from one town., Age was a confounding, factor in the study because older people both exercised less and had more health problems.

BE_B2_Statistics 2.2

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