Experiments on learning in animals sometimes measure how long it takes mice to find their way through a maze. The mean time is 18 seconds for one particular maze. A researcher thinks that a loud noise will cause the mice to complete the maze faster. She measures how long each of 10 mice takes with a loud noise as stimulus. The appropriate hypotheses for the significance test are Но : и < 18; На : и %3D 18. Но : и %3D 18; На : и # 18. Но : и 3D 18; На : и < 18. Но : и %3D 18; На : и> 18.

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