If a soft-drink company performs an experiment with a new type of ...

[xclash]

If a soft-drink company performs an experiment with a new type of soft drink in which experimental subjects always taste this new product first and then taste a competitor's product second, the study has an error in design termed a(n) _____.
 a. history effect
  b. maturation effect
  c. order of presentation effect
  d. guinea pig effect

Question 2

Identify and describe the 8 types of selection bias.

[blfontai]

Answer to Question 1

C

Answer to Question 2

1 . Data-based selection bias:
Ad hoc rejectiondata deemed as bad is rejected
Endpoint selectiondata collection begins when the researcher feels the data has reached an acceptable threshold
Premature terminationa study is terminated when the results appear to be clear to the researcher
2 . Participant-based selection bias:
Unequal selection criteriapre-screening of participants is done based on one of the outcome variables
Drop-out biasdeleting the data of any participant who did not complete a survey
Self-selectionrespondents can decide if they want to participate or not
3 . Study-based selection bias:
File-drawer effectwhen a study is performed multiple times and only the one that favors the desired results is reported
Data miningperforming a huge number of analysis and presenting the most significant results as if they were the only a priori hypotheses