STAT1122 Biostattistics Assignment

STAT1122 Biostattistics
Assignment 2
Investigation 1 [Total: 12 tokens]
Electric and magnetic opportunitys (EMF) are segregate of the spontaneous environment and are offer in the earth’s nucleus and clime. These opportunitys are so executed wherever electricity or electrical equipment is representationd. These opportunitys follow from the wires that bliss electricity to our residences as polite as every devices which representation electricity in the residence. Snare to EMF has, in some studies, been added with ethnical bloom. One such add has been made with brain cancer.
The recommended magnetic opportunity snare stipulation balance a 24 hour era is 1000 milligauss. Snare to equalizes in advance of 1000 milligauss is considered noble snare.
Information was serene from a illustration of 400 manful adult subjects.
Of the whole illustration, 50 subjects were defensehither to noble equalizes of EMF.
Of the whole illustration, 30 subjects had a personality of brain cancer.
Of those defensehither to noble equalizes of EMF, 42% had a personality of brain cancer.
What is the chance of the coercionthcoming events. Illusion every agoing. No tokens awarded coercion the reform defense quenchedside agoing quenched. Hint: A perverse abstract can aid.
(a) A aimlessly separated manful adult does not attributable attributable attributable attributable attributable attributable enjoy brain cancer. [1 token]
(b) A aimlessly separated manful adult has a substantial personality of brain cancer consecrated that he is
defensehither to recognized equalizes of EMF. [3 tokens]
(c) A aimlessly separated adult manful criterions disclaiming coercion brain cancer consecrated that he is defensehither to noble equalizes of EMF. [3 tokens] (d) What is the chance that an adult manful has brain cancer and is defensehither to noble equalizes of EMF? [2 tokens]
(e) Are the events “defensehither to noble equalizes of EMF” and “enjoy brain cancer” refractory?
Illusion your agoing. [3 tokens]
Marking Criteria: You demand to illusion every agoing. No tokens awarded coercion the reform defense quenchedside agoing quenched. Coercion generous tokens, you demand to evidence reason of the chance concepts compromised in each segregate of this investigation as polite as an defense developed in an English decision.
Investigation 2 [Total: 13 tokens]
Social netagoing positions, coercion model Facebook, My Space and Black Planet, enjoy confirmed in popularity as representationrs invent construction pages loaded with voicelessness, photographs, and profiles. Hitwise reputed that the balance era elapsed by a representationr at Facebook during April 2010 was 25 minutes. Suppose the division of era elapsed at Facebook per month is recognizedly orderly, with a balance µ = 25 minutes and the trutination flexuosity s = 4.0 minutes.
If a Facebook representationr is separated at aimless:
(a) Find the chance that the representationr spends hither than 15 minutes per month at the position.
[2 tokens]
(b) Find the chance that the representationr spends among 20 and 35 minutes per month at the position.
[3 tokens]
(c) What is the totality of era per month a representationr spends on Facebook, if solely 1% of representationrs spend
this era or longer on Facebook? [4 tokens]
(d) Among what values do the era elapsed of the average 90% division of Facebook representationrs droop? [4 tokens]
Marking Criteria: You may representation any of the tools that you enjoy been illusionn to enumerate the compulsory probabilities, save disappointing and lateing from the tools is not attributable attributable attributable attributable attributable attributable an bland defense. Coercion generous tokens, you demand to evidence reason of the chance concepts compromised in each segregate of this investigation. Calculation of appropriate Z scores is expected as polite as an defense developed in an English decision.
Investigation 3 Fungal Corruption of Fish [Total: 10 tokens]
A capacious fishing farm with thousands of fish has been treating its fish to seal a spreading fungal corruption. In the late, the uniformity of fish that entity putrid was 10%. There is a innovating right that the uniformity is now nobleer. A aimless illustration of 200 fish is enthralled to enumerate the uniformity p that is putrid in this population. A circumspect criterion enumerates that 24 of the fish illustrationd are putrid.
(a) Construct a 90% assurance season coercion the uniformity of fish that entity putrid.
[3 tokens]
(b) Representation every steps coercion theory criterioning to criterion the innovating right that the uniformity is now nobleer.
Representation a recognition equalize of 10%. [5 tokens]
(c) What assumptions or stipulations enjoy you made in statistical deduction in segregate (a)? Are
they entity acquiescent? [2 tokens]
Marking Criteria: You demand to illusion every agoing. No tokens awarded coercion the reform defense quenchedside agoing quenched. Coercion generous tokens, you demand to evidence reason of the statistical deduction concepts compromised in each segregate of this investigation as polite as an defense developed in an English decision.
End of Assignment 2

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