Score for this attempt: 11.5 out of 12.5
Question 1
0..5 pts
What do non-parallel lines on an interaction graph indicate?
No interaction between the variables and a therefore no interaction effect
Correct!
Some degree of interaction between the variables and a possible interaction effect
No interaction between the variables but a possible interaction effect
Some degree of interaction between the variables and a definitive interaction effect
Question 2
0..5 pts
A medical researcher wanted to test and compare the impact of three different dietary
supplements as a means to examine to what extent dietary supplements can speed up
wound healing times. She randomly selected 36 patients and then randomly divided this
group into three subgroups: a 'placebo' group who ingested sugar pills; a 'Vitamin X'
group who took vitamin pills; and a 'kale' group who took kale pills. The study involved
the groups taking their pill-based supplements three times a day for 1 week, and at the
end their wound healing times were recorded. What sort of research design is this?
Repeated-measures factorial design
Correct!
Independent factorial design
ANOVA
,Multiple linear regression
Question 3
0..5 pts
A sports researcher wanted to test and compare the impact of three different energy
drinks as a means to examine to what extent energy drinks consumed during a workout
increase workout rates. He randomly selected 36 gym-goers and then randomly divided
this group into three subgroups: a 'placebo' group who drank water; a 'caffeine' group
who took a caffeine-rich energy drink; and a 'sugar' group who took a sugar-rich energy
drink. The study involved the groups drinking their energy drink prior to a 30-minute
workout. At the end or their workouts, their workout rates were recorded. What sort of
research design is this?
Repeated-measures factorial design
Correct!
Independent factorial design
Multiple linear regression
ANOVA.
Question 4
0..5 pts
An experiment was done to look at whether there is an effect of the number of hours
spent practising a musical instrument and gender on the level of musical ability. A
sample of 30 (15 men and 15 women) participants who had never learnt to play a
musical instrument before were recruited. Participants were randomly allocated to one
of three groups that varied in the number of hours they would spend practising every
day for 1 year (0 hours, 1 hours, 2 hours). Men and women were divided equally across
groups. All participants had a one-hour lesson each week over the course of the year,
after which their level of musical skill was measured on a 10-point scale ranging from 0
('You can't play for toffee!') to 10 ('Are you Mozart reincarnated?'). An ANOVA was
conducted on these data, and the results revealed significant main effects of gender
, and the number of hours spent practising. Which of the following contrasts could we use
to break down the effect of gender?
Repeated contrast
Helmert contrast
Correct!
None
Simple contrast
Question 5
0..5 pts
A study found that 50 pedestrians gave more money to a street beggar if the beggar
had a cute and hungry-looking dog with them compared to if they were alone. The
gender of the pedestrians was also noted. Which of the following sentences describes a
simple effects analysis on these data?
Using a graph to do a simple inspection of the mean donations from male and female
pedestrians when the beggar had a dog or was alone
The relative difference between male donations and female donations when the beggar
had a dog compared to not
The difference in donations when the beggar had a dog compared to not
Correct!
The effect of having a dog compared to not on donations calculated separately for male
and female pedestrians
Question 1
0..5 pts
What do non-parallel lines on an interaction graph indicate?
No interaction between the variables and a therefore no interaction effect
Correct!
Some degree of interaction between the variables and a possible interaction effect
No interaction between the variables but a possible interaction effect
Some degree of interaction between the variables and a definitive interaction effect
Question 2
0..5 pts
A medical researcher wanted to test and compare the impact of three different dietary
supplements as a means to examine to what extent dietary supplements can speed up
wound healing times. She randomly selected 36 patients and then randomly divided this
group into three subgroups: a 'placebo' group who ingested sugar pills; a 'Vitamin X'
group who took vitamin pills; and a 'kale' group who took kale pills. The study involved
the groups taking their pill-based supplements three times a day for 1 week, and at the
end their wound healing times were recorded. What sort of research design is this?
Repeated-measures factorial design
Correct!
Independent factorial design
ANOVA
,Multiple linear regression
Question 3
0..5 pts
A sports researcher wanted to test and compare the impact of three different energy
drinks as a means to examine to what extent energy drinks consumed during a workout
increase workout rates. He randomly selected 36 gym-goers and then randomly divided
this group into three subgroups: a 'placebo' group who drank water; a 'caffeine' group
who took a caffeine-rich energy drink; and a 'sugar' group who took a sugar-rich energy
drink. The study involved the groups drinking their energy drink prior to a 30-minute
workout. At the end or their workouts, their workout rates were recorded. What sort of
research design is this?
Repeated-measures factorial design
Correct!
Independent factorial design
Multiple linear regression
ANOVA.
Question 4
0..5 pts
An experiment was done to look at whether there is an effect of the number of hours
spent practising a musical instrument and gender on the level of musical ability. A
sample of 30 (15 men and 15 women) participants who had never learnt to play a
musical instrument before were recruited. Participants were randomly allocated to one
of three groups that varied in the number of hours they would spend practising every
day for 1 year (0 hours, 1 hours, 2 hours). Men and women were divided equally across
groups. All participants had a one-hour lesson each week over the course of the year,
after which their level of musical skill was measured on a 10-point scale ranging from 0
('You can't play for toffee!') to 10 ('Are you Mozart reincarnated?'). An ANOVA was
conducted on these data, and the results revealed significant main effects of gender
, and the number of hours spent practising. Which of the following contrasts could we use
to break down the effect of gender?
Repeated contrast
Helmert contrast
Correct!
None
Simple contrast
Question 5
0..5 pts
A study found that 50 pedestrians gave more money to a street beggar if the beggar
had a cute and hungry-looking dog with them compared to if they were alone. The
gender of the pedestrians was also noted. Which of the following sentences describes a
simple effects analysis on these data?
Using a graph to do a simple inspection of the mean donations from male and female
pedestrians when the beggar had a dog or was alone
The relative difference between male donations and female donations when the beggar
had a dog compared to not
The difference in donations when the beggar had a dog compared to not
Correct!
The effect of having a dog compared to not on donations calculated separately for male
and female pedestrians
