You hypothesize that exposure to music has an effect on learning, either helping it or harming it.  You randomly select 18 high school sophomores who have had no exposure to statistics.  Ten of them hear Mozart’s Piano Concerto No. 1 in C Major at 40 decibels (quietly) while they study Chapter 5 in Gravetter’s Statistics text for two hours.  The other 8 study the same text in a library environment. On the exam the test group scored a mean of 70% with a SS of 800.  The control group scored 80% with a Sum of Squares of 600.   State the null hypothesis, both in words and in symbols.

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