In a study of older adults at risk of following

VALID: Use the following information to answer the following 5 questions: In a study of older adults at risk of falling (based on Hannan et al. AJE 2010), participants reported the number of falls over a threermonth period using two methods. In the first method, participants maintained a daily "falls calendar" for 3 months, which is considered the gold standard for ascertaining whether a participant fell and their number of falls. In the second method, researchers performed a telephone survey at the end of3 months. In this method. they asked the same participants to recall whether or not they had fallen in the past 3 months. and if so, how many times, First, the investigators compared the number of participants who reported falling or not using the two methods described above. Falls Calendar . old standard) Telephone Survey Fell Did not fall Fell Did not fall If the positive predictive value of the telephone survey is 81.8%, and the sensitivity is 75.0%, what is the value of A? Please report the answer to the nearest whole number. Use the following additional information for Questions 2 and 3. The following table presents data from the authors' investigation into the cause of the outbreak: Vegetable Inn \"n\"_ Corn Which ofthe following intervals includes the attack rate difference comparing those who ate rice and beans to those who did not? (Select the one best answer) a, [749% to 72 5%] b. [724% to 0%] c. [1% to 10%] d. [11% to 25%] e. [25% to 50%]