Hi there, if anyone could help me with 6 (c) & 11 (d) My Notes Ask Your Teacher

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Hi there, if anyone could help me with 6 (c) & 11 (d)

My Notes Ask Your Teacher 6. 2/3 points | Previous Answers StatsByL01 15.2A.010.CHDS Water quality testing is regularly done on the Chesapeake Bay in the Mid-Atlantic region of the United States. The following table shows the test species' survival rating after a controlled amount of toxins was added to the water Dose % Survival | % Survival (TU) (Test 1) (Test 2) 0 (Control) 95 93 95 10 100 20 100 40 80 93 80 75 86 160 71 320 Is this an observational study or an experiment? O observational study O experiment O neither an observational study nor an experiment O both an observational study and an experiment (a) (b) Identify the population of interest The proportion of the species that survived the toxin O All members of this species in the Chesapeake Bay The species that were exposed to the toxin in the sample O The dose of the toxin used (c) Assuming a sample size of 55, what is the margin of error for Test 2 when a dosage of 160 TU was used with 95% confidence? (Use a table or technology. Round your answer to three decimal places.) 0.126 Submit Answer Save Progress

Explanation / Answer

c)

for 95% CI ; critical value z=1.96

thefore margin of error =z*sqrt(p*(1-p)/n))=0.120

11 d)

here margin of error E = 0.140 for80% CI crtiical Z          = 1.282 estimated proportion=p= 0.710 required sample size n =         p*(1-p)*(z/E)2= 18.00

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