A team of researchers has developed a device that can detect the presence of bacteria in gums. In the development process, they asked another team of researchers to use the device just to investigate whether the external team got similar results as them. What was being investigated: validity or reliability of the measurements? Explain your answer. Part 2: The developed device is not expensive; in fact, it is very affordable. Both the sensitivity and specificity of the device are relatively high being more than 90%. The positive predictive value of the device is 59%. In your opinion, is this device economical? Explain your answer. Your Discussion should be a minimum of 250 words in length and not more than 750 words. Please include a word count. Use APA citations and references for the textbook and any other sources used. Also, be sure to pose 1-2 well thought out questions from which your colleagues can formulate a response or generate further discussion