John is trying to predict how many residents will be residing in Prairieville next year, so he asks you for help. He sees that in 2014 there were 2000 residents, in 2015 there were 4000 residents, in 2016 there were 8000 residents, and in 2017 there were 16000 residents. Using the pattern, predict what the number of residents will be next year in 2018.

Anew test for ra is being developed. the test is administered to 750 patients with ra and 750 without ra. for the sake of the question, assume the prevalence of ra in this population is 50%. of the 750 patients with ra, 575 have a positive result. of the 750 patients without ra, 150 have a positive result. what is the positive predictive value of the new test? a575/(575+150) b. 600/(600+ 150) c. 575/(575+125) d. 600/(600+ 125)