2. Measures of retention of information from lecture,

with and without clicker based questions.

Explaining about sound and how a violin works.

I show class a violin and tell them that the strings cannot

move enough air to produce much sound, so actually

the sound comes from the wood in the back. Point inside

violin to show how there is a sound post so strings can

move the bridge and sound post causes back of violin to

move and make sound. 15 minutes later in the lecture

I asked students a question the sound they hear from a

violin is produced by

a. mostly by strings, b. mostly by wood in back,

c. both equally, d. none of the above.

What fraction gave the correct answer?

a. 0%, b. 10 %, c. 30%, d. 70%, e. 90%

b. 10%

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