need help with my statistics H.w events are andomly someone who has black hair s

Question

need help with my statistics H.w

events are andomly someone who has black hair selecting Are the two events digoint? O2Yes, because the events can cacuratne same ome because cannot occur at the same sme. No, the events aan ocourane same time. Yes, becausame events cannot occur at the same time. Refer to the sample data for pre-employment drug screening shown below. resuta a fase positive? (False positive means that mo device tests positive Pre-EmpormantDAng Screening Results Negative test result Drug indicated rug use Not Indicated Subject Uses Drugs Subjects Nor PI false positive esi Mesut

Explanation / Answer

    Decide whether the following two events are disjoint.
1. Randomly selecting someone who has completely blonde hair
2. Randomly selecting someone who has completely black hair
Are the two events disjoint?
Ans:Yes,because the events cannot occur at the same time

refer to the sample data for pre employment drug screening shown below if one of the subject is randomly selected what is the probability that the test result is a false positive

Ans:    the probability of a false positive test result is =1/(45+2+5+27)
                                                                                                =1/79
                                                                                                =0.0126

Assume that the procedure yeild a binomial distrubution with a trail repeated n times use a clculator to find the probability of x successes giventhe probability p of success on a single trail n=20,x=17,p=0.85

Ans:P(17)=2017(0.85)17(1-0.85)20-17

                  =1140(0.0631)(0.0033)

                    =0.2427

positive test result negative test result subject uses drug 45 5 subject is not a drug user 2 27

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