4. (5 pts) A random variable is said to be discrete when it can take on:...

  

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4. (5 pts) A random variable is said to be discrete when it can take on: A. Prime number values only B. Positive values only C. Non-zero values only D. An infinite number of values over any range E. A finite number of values over any range that includes neither minus infinity nor positive infinity Use this information for questions 5-6 A disease research organization conducts studies regarding the diagnosis of a new disease. The diagnosis is not always perfect in predicting the disease. Suppose that there is a 50% chance that a person gets that disease (and a 50% chance that he/she doesn't). In the past, for all people that actually had the disease, 80% were diagnosed to be positive with it (and the other 20% were inaccurately predicted to be negative). Also, for all people that didn't get the disease, 70% were predicted to be negative to it (and the other 30% were inaccurately predicted to be positive). 5. (15 pts) For any randomly selected person, what is the probability that the diagnosis would indicate that the person has the disease? a) 0.80 b) 0.50 c) 0.45 d) 0.55 e) 0.95 6. (15 pts) If the diagnosis says that the person has the disease, what is the probability that he/she would actually be sick? a) 0.27 b) 0.73 c) 0.80 0.24 e) 1.00 d) 4. (5 pts) A random variable is said to be discrete when it can take on: A. Prime number values only B. Positive values only C. Non-zero values only D. An infinite number of values over any range E. A finite number of values over any range that includes neither minus infinity nor positive infinity Use this information for questions 5-6 A disease research organization conducts studies regarding the diagnosis of a new disease. The diagnosis is not always perfect in predicting the disease. Suppose that there is a 50% chance that a person gets that disease (and a 50% chance that he/she doesn't). In the past, for all people that actually had the disease, 80% were diagnosed to be positive with it (and the other 20% were inaccurately predicted to be negative). Also, for all people that didn't get the disease, 70% were predicted to be negative to it (and the other 30% were inaccurately predicted to be positive). 5. (15 pts) For any randomly selected person, what is the probability that the diagnosis would indicate that the person has the disease? a) 0.80 b) 0.50 c) 0.45 d) 0.55 e) 0.95 6. (15 pts) If the diagnosis says that the person has the disease, what is the probability that he/she would actually be sick? a) 0.27 b) 0.73 c) 0.80 0.24 e) 1.00 d)

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