A music teacher had noticed that some students went to pieces during exams. He wanted to test whether this performance anxiety was different for people playing different instruments. He took groups of guitarists, drummers and pianists (variable = 'Instru') and measured their anxiety (variable = 'Anxiety') during the exam. He also noted the type of exam they were performing (in the UK, musical instrument exams are known as 'grades' and range from 1 to 8) . He wanted to see whether the type of instrument played affected performance anxiety when accounting for the grade of the exam.
-Which of the following statements best reflects what the effect of 'Instru' in the output table below tells us? 
Definitions:
Ecological Theory
A framework for understanding the complex interactions between individuals and their environments, emphasizing the multi-layered nature of those interactions.
Minority Group
A sociological term referring to a group of people who, due to their physical or cultural characteristics, are singled out from the others in the society in which they live for differential and unequal treatment.
Majority Population
The segment of a population that makes up more than half of its total, often possessing sociopolitical power or cultural dominance.
Symbolic Ethnicity
A form of ethnicity where attachment to one’s heritage is more symbolic than based on actual customs or traditions.
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