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(a) Discuss why screening strategies should be recommended for monitoring indoor air quality (IAQ) in air-conditioned offices in Hong Kong. (8 marks) (b) Given

(a) Discuss why screening strategies should be recommended for monitoring indoor air quality (IAQ) in

(a) Discuss why screening strategies should be recommended for monitoring indoor air quality (IAQ) in air-conditioned offices in Hong Kong. (8 marks) (b) Given the screening level of airborne bacteria level is 1000 CFU/m, the pre-assessment odds is 0.3, and the expected bacteria level in CFU/m is 0-0.022T2.441.2, where T is air temperature (C) and is relative humidity (%), the likelihood ratio of excessive airborne bacteria counts is 3x10-1204, determine the increment of the post-assessment probability of positive outcomes of an air-conditioned office set-point shifting from T-23.5C and -50% to 25.5C and 60%. (12 marks) (c) For the office in (b) at T=25.5C and 0-60%, a screening test showed a negative test result (980 CFU/m). The probabilities of larger than the baseline of 1000 CFU/m of failure and non-failure offices are 0.2 and 0.8, respectively. Determine the probability of tested false negative. (5 marks)

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