1. true or falseRandomization eliminates the potential for confounding by both known and unknown risk factors for disease

2. true or falseA cross-sectional study of the relationship between blood type and the risk of cataracts will produce misleading results because researchers can't determine the temporal relationship between the exposure (blood type) and the disease (cataracts).

3. true or falseEpidemiologists can tell if confounding is present by examining the strength of the crude measure of association.

4. true or falseIndicate whether the following statement is true or false: An ecological study was done to determine the relationship between per capita soft drink consumption and mortality rates from diabetes in 10 U.S. states. The investigators found a strong association between soft drink consumption and diabetes mortality. Based on this study, we can conclude that individuals with higher consumption of soft drinks have a higher risk of death due to diabetes.