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What is a stratified sample?

Stratified sampling is a technique used in some instances to generate a 'fairer' sample than standard random sampling. Wherein a population is divided into subgroups called 'strata'. These strata are usua...

LS
Answered by Lewis S. Maths tutor
5173 Views

Show, by counter-example, that the statement "If cos(a) = cos(b) then sin(a) = sin(b)" is false.

Let a=60 and b=300.

Then cos(a)=cos(60)=0.5 and cos(b)=cos(300)=0.5, therefore cos(a)=cos(b).

Then sin(a)=sin(60)=sqrt(3)/2 and sin(b)=sin(300)=-sqrt(3)/2, therefore sin(a)=sin(b) is incorre...

OG
Answered by Osian G. Maths tutor
4056 Views

Discuss 'deviation from ideal mental health' as a definition of abnormality. (8 marks)

This definition identifies the characteristics required for good mental health, and suggests that the further an individual is from this ideal, the more likely they are to be classified as abnormal. Jahod...

BE
Answered by Betsy E. Psychology tutor
20466 Views

Written Assignment task: example of a rationale

“Lord of the Flies”, a novel written by William Golding, tells the story of boys who survived on an island after the plane’s crash. After the accident, the competition between two main characters, Ralph a...

MS
19771 Views

Compare and contrast the "Schulsystem" in two chosen countries.

Die Grundschule in Polen ist länger als die in Deutschland: sie dauert 9 Jahre und in Deutschland 4 Jahre. Wenn das Kind 12 Jahre alt ist, muss es wählen, ob es auf das Gymnasium, die Hauptschule oder die...

MS
Answered by Maria S. German tutor
1681 Views

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