12) Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at the 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 other 500 subjects, the oil was washed off after 5 minutes. The results are summarized in Table 5-5. 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 minutes, A= washing oil off after 5 minutes, N= no reaction, M= mild reaction, S= strong reaction. Find the following probabilities for a person selected 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 mutually exclusive? Explain.
f) Are the events N = no reaction and W- washing oil off within 5 minutes independent? Explain.

  1. 👍
  2. 👎
  3. 👁
  1. 2.127

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. English

    Label each group of words as R for run-on sentences or S for correct sentences. A:Many plants have poisonous leaves or fruits, these cause skin irritation or sickness...R B:As a child I learned not to touch the nettle, I learned

  2. biology

    1. Suppose you plant a seed and observe that a tree of large mass grows from it. The tree achieves a final mass that changes very little for years afterward. Which of the following is true about the tree? (1 point) Both anabolic

  3. chemistry- electrochemical cell

    What makes this an oxidation-reaction? 3Ag2S+2Al(s) -> Al2S3+6 Ag(s)? Write the half-reactions showing the oxidation and reduction reactions. Identify which is the oxidation reaction and which is the reduction reason. What is

  4. science (URGENT!! CORRECT PLEASE))

    (1) in order for an organism to develop specialized tissues the organism must be which of the following A) A Plant B) An Animal C) Unicellular D) Multicellular ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ My answer: D

  1. Chemistry

    Just a few questions about rates of reaction. A) Why are the units for average and instantaneous rates the same? -because they are both measures of how quickly a reaction is occuring per unit time B) For a given set of data, two

  2. English

    Since Debbie's last test score was __________, she plans on studying __________ this time around. A. the miserablest; most diligently B. more miserable; most diligently C. miserably; diligent D. miserable; more diligently D

  3. chemistry

    2. What is the reduction half-reaction for the following unbalanced redox equation? Cr2O72– + NH4+ Cr2O3 + N2 A.) Cr2O3 -> Cr2O7^2– *B.) Cr2O72– -> Cr2O3 C.) NH4+ -> N2 D.) N2 -> NH4+ 3. Which oxidation-reduction reactions

  4. Chemistry

    Please help me with this-- I don't understand it. Calculate the change of enthalpy for the reaction 2Al (s) + 3Cl2 (g) --> 2AlCl3 (s) from the following reactions: Reaction 1: 2Al (s) + 6HCl (aq) --> 2AlCl3 (aq) + 3H2 (g);Change

  1. chemistry

    A student performed two side-by-side reactions to test the decomposition of N2O5. The only difference between the two reactions was reactant concentration — reaction 1 started with 2 M N2O5 and reaction 2 started with 1.2 M.


    2 HgCl2 (aq) + SnCl2 (aq) --> SnCl4 (aq) + Hg2Cl2 (s) Hg2Cl2 (aq) + SnCl2 (aq) --> 2Hg (s) + SnCl4 (aq) For each reaction, write the two half-reactions that make it up and calculate the overall reaction potential by adding the two

  3. Health (Ms. Sue)

    1. Summarize how common substances can trigger allergic reactions. A: Common substances can trigger allergic reactions when immune systems cells encounter a foreign particle, sending out chemical signals that cause the body to

  4. English

    In Romeo and Juliet, why did Romeo choose poison instead of a dagger on himself when he found out that Juilet was "dead"? I can figure out that money was what poisoned the Capulets and Montagues. So he would like to buy poison

You can view more similar questions or ask a new question.