If a researcher is worried that the results of a study done on taboo words in the 1940s might not yield the same results with students of today, the researcher is concerned about O external validity Internal validity statistical conclusion validity rollabilityYou tell your friend you did a study and found that people who drink tea are happier than people who drink coffee. They respond: "But wait, it seems like people who drink lea are also, on average, older. Do you think maybe your effect was due more to age than what people drink?", Your friend is asking about the of your study, construct validity statistical conclusion validity internal validity external validity