SOLUTION: Much has been made of the concept of experimenter bias, which refers to the fact that even the most conscientious experimenters tend to collect data that come out in the desired di

Question 1202106: Much has been made of the concept of experimenter bias, which refers to the fact that even the most conscientious experimenters tend to collect data that come out in the desired direction (they see what they want to see). Suppose we use students as experimenters. All the experimenters are told that subjects will be given caffeine before the experiment, but one-half of the experimenters are told that we expect caffeine to lead to good performance and one-half are told that we expect it to lead to poor performance. The dependent variable is the number of simple arithmetic problems the subjects can solve in 2 minutes. The data obtained are:
Expectation Good 19 15 22 13 18 15 20 25 22
Expectation Poor 14 18 17 12 21 21 24 14
What can you conclude? Test the hypothesis at α = 0.05.

Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
i used the two sample t-test calculator at https://www.graphpad.com/quickcalcs/ttest1.cfm

the results are shown below:

the criteria for the test was objective in that the number of correct answers
in two minutes is factual, having nothing to do with any expectations of the experimenters.

the results of the test are that the differences between the groups are not significant.
this means the difference in the means between the two groups can be explained by normal variations in sample means, rather than from any other factor.

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