Number 24 In Exercises 23-26, use these results from the \"1-Panel-THC\" test fo
ID: 3170359 • Letter: N
Question
Number 24 In Exercises 23-26, use these results from the "1-Panel-THC" test for marijuana use, which is provided by the company Drug Test Success: Among 143 subjects with positive test results, there are 24false positive results, among negative results, there false negative results. Screening for Marijuana Use If 2 of the subjects are selected without randomly placement, what is the probability that they both had correct test results (either true positive or true negative)? Is such an event unlikely? screening for Marijuana Use If 2 of the subjects are randomly selected without replacement, hat is the probability that they both had incorrect test results false positive negative)? Is such an event unlikely? Screening for Marijuana Use If 3 of the subjects are randomly selected without replacement, what is the probability that they all had false positive test results? Is such an event unlikely?Explanation / Answer
The following table illustrates the results.
24. The probability of false positive is: 24/143=0.1678 and probability of false negative is:3/157=0.0191
Therefore, if two subjects are selected without replacement, both had incorrect test results is as follows:
P(False positive or False negative)=P(False positive)+P(False negative)
=0.1678+0.0191
=0.1869 (ans)
No the event is not unlikely as, the probability is not less than 5%.
Disease True False Result Positive 119 24 143 Negative 154 3 157 273 27 300Related Questions
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