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 controlling for the grade of the exam. The second part of the SPSS output is below. Which of the following statements best reflects the effect of 'Instru'? 
Definitions:
Radio
A technology that uses radio waves for communication by transmitting and receiving sounds, such as music and voice, over distances without wires.
Satellite
An artificial object placed into orbit around the Earth or another planet in order to collect information or for communication.
Fiber
A type of material used in various industries, or short for optical fiber, a technology used for transmitting information as pulses of light along strands of glass or plastic.
Wi-Fi Hotspot
A physical location where people can access the Internet, typically using Wi-Fi, via a wireless local area network (WLAN) with a router connected to an internet service provider.
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