Can you tell me whether the answer is True or False for the questions below?
A. Researchers should be willing to do cross-checks of data from multiple sources to determine the similarity of independent projects.
B. Two major drawbacks of secondary data are determining the accuracy of the data and finding data that fit the specifications of the project.
C. At the race track, to say that a winning ticket pays 40 to 1 for a winning bet indicates a ratio scale.
D. Although reliability is necessary for validity, it is not in itself sufficient to make a measure valid.