To test the following hypotheses at the 0.05 level of significance, using a sample size of n = 15. 
What is the upper tail critical value?
Definitions:
Sensory Input
Information received by sensory organs that is then processed by the brain.
Opponent Process Theory
A psychological and neurological model that explains a wide range of behaviors, including vision and emotions, by proposing that certain elements (e.g., colors or feelings) operate in opposition to each other.
Trichromatic Theory
A theory explaining color vision as a result of the eye containing three types of receptors sensitive to different light wavelengths.
Colour Vision
The ability of the eye and brain to distinguish objects based on the wavelengths of light they reflect, emit, or transmit.
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