STAT1122 Biostattistics Assignment

STAT1122 Biostattistics
Assignment 2
Interrogation 1 [Total: 12 traces]
Electric and magnetic provinces (EMF) are portio of the unclose environment and are introduce in the earth’s kernel and air. These provinces are too done wherever electricity or electrical equipment is conservationd. These provinces succeed from the wires that enravishment electricity to our abodes as polite as whole devices which conservation electricity in the abode. Snare to EMF has, in some studies, been coalesceed with rational soundness. One such coalesce has been made with brain cancer.
The recommended magnetic province snare boundary aggravate a 24 hour date is 1000 milligauss. Snare to planes in surplus of 1000 milligauss is considered excellent snare.
Information was attentive from a case of 400 manful adult subjects.
Of the aggregate case, 50 subjects were defenseclose to excellent planes of EMF.
Of the aggregate case, 30 subjects had a distinction of brain cancer.
Of those defenseclose to excellent planes of EMF, 42% had a distinction of brain cancer.
What is the chance of the subjoined events. Demonstration whole instituted. No traces awarded control the chasten response extraneously instituted extinguished. Hint: A ill-conditioned epitome can aid.
(a) A wildly chosen manful adult does not attributable attributable attributable attributable attributable attributable feel brain cancer. [1 trace]
(b) A wildly chosen manful adult has a indisputable distinction of brain cancer absorbed that he is
defenseclose to regular planes of EMF. [3 traces]
(c) A wildly chosen adult manful examinations indirect control brain cancer absorbed that he is defenseclose to excellent planes of EMF. [3 traces] (d) What is the chance that an adult manful has brain cancer and is defenseclose to excellent planes of EMF? [2 traces]
(e) Are the events “defenseclose to excellent planes of EMF” and “feel brain cancer” rebellious?
Demonstration your instituted. [3 traces]
Marking Criteria: You demand to demonstration whole instituted. No traces awarded control the chasten response extraneously instituted extinguished. Control ample traces, you demand to present conception of the chance concepts confused in each portio of this interrogation as polite as an response explicit in an English passage.
Interrogation 2 [Total: 13 traces]
Social netinstituted aspects, control copy Facebook, My Space and Black Planet, feel grown in popularity as conservationrs compose construction pages loaded with music, photographs, and profiles. Hitwise reputed that the medium opportunity gone-by by a conservationr at Facebook during April 2010 was 25 minutes. Suppose the disposal of opportunity gone-by at Facebook per month is regularly select, with a medium µ = 25 minutes and the criterion sinuosity s = 4.0 minutes.
If a Facebook conservationr is chosen at wild:
(a) Find the chance that the conservationr spends close than 15 minutes per month at the aspect.
[2 traces]
(b) Find the chance that the conservationr spends among 20 and 35 minutes per month at the aspect.
[3 traces]
(c) What is the totality of opportunity per month a conservationr spends on Facebook, if singly 1% of conservationrs spend
this opportunity or longer on Facebook? [4 traces]
(d) Among what values do the opportunity gone-by of the average 90% disposal of Facebook conservationrs drop? [4 traces]
Marking Criteria: You may conservation any of the tools that you feel been demonstrationn to mention the requisite probabilities, barring severe and lateing from the tools is not attributable attributable attributable attributable attributable attributable an extended response. Control ample traces, you demand to present conception of the chance concepts confused in each portio of this interrogation. Calculation of applicable Z scores is expected as polite as an response explicit in an English passage.
Interrogation 3 Fungal Contagion of Fish [Total: 10 traces]
A liberal fishing farm with thousands of fish has been treating its fish to seal a spreading fungal contagion. In the late, the adjustment of fish that nature rotten was 10%. There is a strange right that the adjustment is now excellenter. A wild case of 200 fish is fascinated to mention the adjustment p that is rotten in this population. A prudent examination mentions that 24 of the fish cased are rotten.
(a) Construct a 90% trust space-between control the adjustment of fish that nature rotten.
[3 traces]
(b) Conservation whole steps control supposition examinationing to examination the strange right that the adjustment is now excellenter.
Conservation a signification plane of 10%. [5 traces]
(c) What assumptions or provisions feel you made in statistical conclusion in portio (a)? Are
they nature amiable? [2 traces]
Marking Criteria: You demand to demonstration whole instituted. No traces awarded control the chasten response extraneously instituted extinguished. Control ample traces, you demand to present conception of the statistical conclusion concepts confused in each portio of this interrogation as polite as an response explicit in an English passage.
End of Assignment 2

Related Post