Please explain!! Researchers want to study the association between calcium intake and prostate cancer risk. However, the researchers are using an existing data set from a study that assessed diet by asking participants to fill out a short 20-item questionnaire. What threat to validity is described in this scenario, if any? Nondifferential misclassification of outcome Nondifferential misclassification of exposure Measurement bias Solution b. Nondifferential misclassification of exposure.