Question
Experimenter bias refers to the phenomenon that data tends to comes out in the desired direction even for the most conscientious experimenters.A social psychologist is
Experimenter bias refers to the phenomenon that data tends to comes out in the desired direction even for the most conscientious experimenters.A social psychologist is curious about this phenomenon.In a study, the psychologist tells a sample of students that they will be experimenters in study that investigates the impact of caffeine on cognition.The experimenters are told that all subjects will be given caffeine an hour before solving arithmetic problems.However, half of the experimenters are told that caffeine will lead to better performance and the other half are told nothing.The experimenters are then asked to grade the arithmetic problems.What can the psychologist conclude with anof 0.01?Below are the grades that they gave
told nothing leads to better performance
18 12
15 14
21 10
12 8
17 14
14 17
21 20
24 10
a)What is the appropriate test statistic?
---Select---
na
z-test
One-Sample t-test
Independent-Samples t-test
Related-Samples t-test
b)
Condition 1:
---Select---
grades
experimenter bias
told caffeine leads to better performance
told nothing
the phenomenon
Condition 2:
---Select---
grades
experimenter bias
told caffeine leads to better performance
told nothing
the phenomenon
c)Compute the appropriate test statistic(s) to make a decision aboutH0.
(Hint: Make sure to write down the null and alternative hypotheses to help solve the problem.)
critical value =;test statistic =
Decision:
---Select---
Reject H0
Fail to reject H0
d)If appropriate, compute the CI. If not appropriate, input "na" for both spaces below.
[,]
e)Compute the corresponding effect size(s) and indicate magnitude(s).
If not appropriate, input and/or select "na" below.
d=;
---Select---
na
trivial effect
small effect
medium effect
large effect
r2=;
---Select---
na
trivial effect
small effect
medium effect
large effect
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