Keristen runs a website that helps people learn programming. Every month keristen receives subscription fees of $10 from each subscriber to her website. Last month the website had 100 subscribers. This month 30 new members joined the website and 10 members cancelled their subscription. How much money will kierstens online business earn from this month?

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect