#9343 | AsPredicted

As Predicted:Swedish Fish Poisson Regressions - March 2018 (#9343)


Created:       03/22/2018 11:37 PM (PT)

This is an anonymized version of the pre-registration.  It was created by the author(s) to use during peer-review.
A non-anonymized version (containing author names) should be made available by the authors when the work it supports is made public.

1) Have any data been collected for this study already?
No, no data have been collected for this study yet.

2) What's the main question being asked or hypothesis being tested in this study?
In this experiment we will test two competing hypotheses on the effects of fish-related priming on fish-reminiscent snack consumption:
H1: Priming participants with thoughts of fish will make them crave fish and result in them taking more Swedish fish candies when they are offered as a reward for taking a survey.
H2: Priming participants with thoughts of fish will make them empathize with the plight of fish and result in them taking fewer Swedish fish candies when they are offered as a reward for taking a survey.


3) Describe the key dependent variable(s) specifying how they will be measured.
Amount of Swedish fish selected by the participant on completing the survey.

4) How many and which conditions will participants be assigned to?
Two conditions. In one condition the experiment is wearing a blue shirt, priming thoughts of water and thus fish. In the other the experimenter is wearing a neutral color, black, which is unrelated to water or fish. The experimenter will change shirts every 15 minutes.
In both conditions the participant will be given a survey asking for gender and age.


5) Specify exactly which analyses you will conduct to examine the main question/hypothesis.
We will run a Poisson regression with a DV of Swedish fish taken and an IV of the participant’s condition.

6) Describe exactly how outliers will be defined and handled, and your precise rule(s) for excluding observations.
We will not exclude outliers but will also report our results with individuals 2 standard deviations away from the mean on our DV excluded.

7) How many observations will be collected or what will determine sample size?
No need to justify decision, but be precise about exactly how the number will be determined.

We will collect 50 individuals per condition.

8) Anything else you would like to pre-register?
(e.g., secondary analyses, variables collected for exploratory purposes, unusual analyses planned?)

DISCLAIMER: This experiment is part of a demonstration for a methods paper, not a paper on the effects of fish-priming.