evaluation of Jacob's XYY study

Question 1

what is a strength of Jacob’s XYY study?

Answer 1

high validity

Question 2

why is Jacob’s XYY study high in validity?

Answer 2

similar to Jacob et al’s - price and whatmore found the same links between XYY syndrome and property crime

Question 3

what us a limitation of Jacob’s XYY study?
(cause and…?)

Answer 3

cause and effect

Question 4

why is the cause and effect of Jacob’s XYY study a limitation?

Answer 4

even if violent offenders have this syndrome - it DOESN’T prove it is the cause of their violence, only that it is a link between the 2.

it is also very rare with 1 in 10 0 0 men

Question 5

what is another limitation of Jacob’s XYY study?
(types)

Answer 5

stereotypes

Question 6

why are stereotypes a limitation in Jacob’s XYY study?

Answer 6

tall and well built, fits the stereotype of ‘violent offenders’ and get labelled as such by the courts- more likely to get a prison sentence

• over represented in samples drawn from prisoners

overestimates the importance of the syndrome

Question 7

what is another limitation of Jacob’s XYY study?
(over….?)

Answer 7

over representation

Question 8

why is over representation a limitation in Jacob’s XYY study?

Answer 8

due to them having typically low intelligence they are more likely to be caught

sample drawn from prisoners are therefore skewed