practical

Question 1

aim

Answer 1

investigate the relationship between average hours of sleep and aggression, measured using the Buss and Perry questionnaire

Question 2

alternate hypothesis

Answer 2

there will be a significant negative correlation between sleep in hours and mins and aggression score out of 145

Question 3

null hypothesis

Answer 3

there will be no negative correlation between sleep in hours and mins and aggression score out of 145
any differences found will be due to change

Question 4

sample

Answer 4

20 ppts
6 male, 14 female
16-17 y o psych students
opportunity sample

Question 5

procedure

Answer 5

informed consent gained from ppts
3 consecutive nights, timer when going to sleep, wrote down in hrs and mins amount of sleep
each morning at 10 am, filled out buss perry questionnaire 5 point scale, scores out of 145
average for both calculated
debrief

Question 6

controls

Answer 6

10 am so events during day did not affect score
reverse questions
stopwatch and questionnaire - standardised procedure

Question 7

results

Answer 7

weak negative correlation
observed value 0.21 for spearmans rho lower than critical 0.38 not significant

Question 8

generalisability

Answer 8

only 16-17 year olds
only psych students

Question 9

reliability

Answer 9

standardised procedures
replicable

Question 10

validity

Answer 10

doesn’t consider variables eg naps, not falling asleep until after timer