Dr. ingo larsen is testing the effectiveness of a new memory-enhancing study technique. he greets each participant at the door and escorts them into either the control group (that receives the old memory technique) or the experimental group (that receives the new memory technique). he then conducts the experiment and analyzes the results. this is all quite problematic, because of the potential presence of
a. nocebo outcomes
b. rival hypotheses
c. sharpening and leveling
d. experimenter expectancy effects

d. experimenter expectancy effects

Explanation:

According to my research on different research method problems, I can say that based on the information provided within the question this is all quite problematic, because of the potential presence of experimenter expectancy effects. This refers to the influence that a researcher may have on the outcome of an experiment simply by being present or interacting with the subjects in the study.

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the number of senators, and representatives, the state has in congress.

is this an essay or multiple choice