We have found that students who study by giving themsclves quizzes recall a greater proportion of words than students who study by rcading. also, we scc that there is an cffect, but often the question of interest is not "is there an effect? " but instead "how big is the e ect? " t address ths second quest on, use the inf ation given below to fi da % confidence inte a for the difference in propor ons where epresents e op tion of tems correctly recalled by all students who study using a sclf quiz method and p2 represents the proportion of items correctly recalled by all students who study using a reading only approach. assume that the standard error for a bootstrap distribution of chrenoes is also about 0.07 the proportion of tems correctly recalled was 0.15 or the reading-study group and 0.42 for the self-quiz group. round your answers to two decimal places.

In january 2010, you began a one-year study of tuberculosis (tb) in a subsidized housing community in the lower east side of new york city. you enrolled 500 residents in your study and checked on their tb status on a monthly basis. at the start of your study on january 1st, you screened all 500 residents. upon screening, you found that 30 of the healthy residents had been vaccinated for tb and therefore were not at risk. another 20 residents already had existing cases of tb on january 1st. on february 1st, 5 residents developed tb. on april 1st, 10 more residents developed tb. on june 1st, 10 healthy residents moved away from new york city and were lost to follow-up. on july 1st, 10 of the residents who had existing tb on january 1st died from their disease. the study ended on december 31, 2010. assume that once a person gets tb, they have it for the duration of the study, and assume that all remaining residents stayed healthy and were not lost to follow-up. is the subsidized housing community in the lower east side of new york city a dynamic or fixed population? briefly explain the rationale for your answer. dynamic population it can changeable people can move out and move in into the population of a subsidized housing what was the prevalence of tb in the screened community on january 1st? prevalence = 30/500 0.06= 6% what was the prevalence of tb on june 30th? prevalence= 40/450=0.08= 8.88% what was the cumulative incidence of tb over the year? cumulative incidence = number of new cases/number in candidate population)over specified time period 10/450 = 2.2% suppose that you wanted to calculate the incidence rate of tb in the study population. calculate the amount of person-time that would go in the denominator of this incidence rate. be sure to show your work.