Clostrodium difficile infection (CDI), a major hospital-acquired infection, has become a significant public health issue. A researcher hypothesized that the number of days stayed in a hospital is associated with such infection. She had the following research question. Identify the most appropriate test to answer the question. Is the average number of days stayed in the hospital different between those aged 65 years plus or less than 65 years? Group of answer choices ANOVA Two sample t test, after checking for equal variance Paired T-Test One sample t test