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	<title>De Rerum Natura &#187; test assessment</title>
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		<title>Student answers versus random answers</title>
		<link>http://www.corrada.com/blog/2008/03/31/student-answers-versus-random-answers/</link>
		<comments>http://www.corrada.com/blog/2008/03/31/student-answers-versus-random-answers/#comments</comments>
		<pubDate>Mon, 31 Mar 2008 17:34:43 +0000</pubDate>
		<dc:creator>Andrés</dc:creator>
				<category><![CDATA[Compressed Sensing]]></category>
		<category><![CDATA[Randomness]]></category>
		<category><![CDATA[test assessment]]></category>

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		<description><![CDATA[An interesting baseline for thinking about precision error is to consider the case of uniformly random answers. The student may be completely ignorant: you gave a college level test to kindergarten kids. Your questions were so hard or so incomprehensible (think Chris Kattan&#8217;s mumbling character giving a &#8220;uupp-uizzz&#8221; (pop-quiz) to this students) that students are [...]]]></description>
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		<title>Minimum number of questions needed for an exam</title>
		<link>http://www.corrada.com/blog/2008/03/29/minimum-number-of-questions-needed-for-an-exam/</link>
		<comments>http://www.corrada.com/blog/2008/03/29/minimum-number-of-questions-needed-for-an-exam/#comments</comments>
		<pubDate>Sat, 29 Mar 2008 18:12:59 +0000</pubDate>
		<dc:creator>Andrés</dc:creator>
				<category><![CDATA[precision error application]]></category>
		<category><![CDATA[Randomness]]></category>
		<category><![CDATA[test assessment]]></category>

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		<description><![CDATA[Another application of the precision error covariance matrix is to find out the minimum number of questions needed for an exam. The linear algebra system derived from the precision erorr equations requires at least three scientific models before one can measure the precision error. More is better. But what is enough? How many questions does [...]]]></description>
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		<title>Grading mistake detection with precision error</title>
		<link>http://www.corrada.com/blog/2008/03/28/grading-mistake-detection-with-precision-error/</link>
		<comments>http://www.corrada.com/blog/2008/03/28/grading-mistake-detection-with-precision-error/#comments</comments>
		<pubDate>Fri, 28 Mar 2008 21:51:30 +0000</pubDate>
		<dc:creator>Andrés</dc:creator>
				<category><![CDATA[precision error application]]></category>
		<category><![CDATA[Randomness]]></category>
		<category><![CDATA[test assessment]]></category>

		<guid isPermaLink="false">http://www.corrada.com/blog/2008/03/28/grading-mistake-detection-with-precision-error/</guid>
		<description><![CDATA[While making a covariance matrix for eighteen questions in an introductory Physics exam I gave in the Spring of 2006, I discovered another use for the precision error measurements: grading mistake detection. The figure shown first is my initial try. I computed the student score on each question with the function: $f(\text{correct})=1.0, f(\text{incorrect})=0.0$.. Note the [...]]]></description>
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