A conservationist suspects that the water level in Horseshoe Lake has been affected more by the current drought than the water level in Swan Lake, so he measures how far the water level is below normal each day in June. The data are normally distributed. Test his hypothesis at α = 0.01. 
Definitions:
Dissociative Identity Disorder
A psychological condition where an individual experiences two or more distinct and alternating personality states, which may involve amnesia, identity confusion, and depersonalization.
Subpersonalities
Different parts or aspects of one's personality that can surface in varying contexts or emotional states.
Preferences
Individual likes, choices, or inclinations that inform decision-making.
Evoked Potential
A measure of the electrical activity in the brain in response to specific stimuli, used to assess neurological function.
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