Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 18 Sep 2017 My Price 8.00

Reaction to Poison Ivy

Survey: Reaction to Poison Ivy Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at Allergy Institute did a study to determine the effects of washing the oil off within 5 minutes of exposure. A random sample of 1000 people with known allergies to poison ivy participated in the study. Oil from the poison ivy plant was rubbed on a patch of skin. For 500 of the subjects, it was washed off within 5 minutes. For the other 500 subjects, the oil was washed off after 5 minutes. The results are summarized in Table 4-5.

TABLE 4-5 Time Within Which Oil Was Washed Off

 

Reaction

Within 5 Minutes

After 5 Minutes

Row Total

None

420

50

470

Mild

60

330

390

Strong

20

120

140

Column Total

500

500

1000

Let’s use the following notation for the various events: W =washing oil off within 5 minute, A = washing oil off after 5 minutes, N= no reaction, M= mild reaction, S=  strong reaction. Find the following probabilities for a personselected at random from this sample of 1000 subjects.

(a) P(N), P(M), P(S)

(b) P(N | W), P(S | W)

(c) P(N | A), P(S | A)

(d) P(N and W), P(M and W)

(e) P(N or M). Are the events N =no reaction and M =mild reaction mutaually exclusive? Explain.

(f) Are the events N= no reaction and W =washing oil off within 5 minutes independent? Explain.

Answers

Maurice Tutor
(5)
Status NEW Posted 18 Sep 2017 10:09 PM My Price 8.00

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