wapondents were ashed whether they had ever been in a car aceident. 21s reaponde

Question

wapondents were ashed whether they had ever been in a car aceident. 21s reapondente indicated that they had been in a cor accident and 449 respondents soid thet they had not a It one of these respondents is randomly selected, what is the probability of ting someone who has been in a car accident? Round to the nearest thousandth, gett if necessary 2. 215 otal peo O.324 b. If one of these respondents is randomly selected, what is the probability of getting someone who has not been in a car accident? Round to the nearest thousandth, if necessary idet44a 2. Refer to the table which summarizes the results of testing for a certain disease. Positive Test Results Negative Test Results Has Disease 85 Doesn't Have Disease 28 7 153 If one of the results is randomly selected, what is the probability that it is a false positive (test indicates the person has the disease when in fact they don't)? a If one of the results is randomly selected, what is the probability that the person tests positive given that they have the disease? b.

Explanation / Answer

( onl;y question 2 (part a ) seems wrong

1 a)

P(in a car accident)=215/(215+449)=215/664

b)P(not in a car accident)=449/664

2)

a)

P(false positive)=P(test positive|not have disease)=28/(28+153)=28/181

b)

P(test positive|have disease)=85/(7+85)=85/92

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