<TestItem CLASS="FR" METHOD="keyinput">
<Stem>
	<Paragraph><Sentence>Find the common difference for the following arithmetic sequence: </Sentence></Paragraph>
	<Paragraph><Sentence><Blockquote>0.00, 0.49, 0.98, 1.47, 1.96, <emphasis>. . .</emphasis></Blockquote></Sentence></Paragraph>
</Stem>
<input_collection>
	<inputfield type="inline" size="shortest">Enter your answer here: </inputfield>
</input_collection>
<key TYPE="math" >
    <response SCORE="1" EVIDENCEVAL="1">
        <observable>0.49</observable>
        <feedback TYPE="Student">Right!</feedback>
        <feedback TYPE="Teacher">The student got this item correct.</feedback>
    </response>
    <response  SCORE="0" EVIDENCEVAL="0">
        <observable>2.45</observable>
        <feedback TYPE="Student">Nice try, but incorrect. You typed the next number in the
 sequence, but you should have typed in the common difference, which is 0.49. </feedback>
        <feedback TYPE="Teacher">The student got this item incorrect.</feedback>
    </response>
    <response SCORE="0" EVIDENCEVAL="0">
        <observable ANY="true"/>
        <feedback TYPE="Student">Sorry, that was incorrect. To find the common difference 
in an arithmetic sequence, figure out the difference between any adjacent pair of numbers. </feedback>
        <feedback TYPE="Teacher">The student got this item incorrect.</feedback>
    </response>
</key>	
<Metadata>
    <AeL ItemNode="tCommonDifference2c" Difficulty="2">
        <PMNode LINK="true">CommonDifference</PMNode>
    </AeL>
</Metadata>

</TestItem>
