{"id":5322,"date":"2014-09-22T13:31:34","date_gmt":"2014-09-22T20:31:34","guid":{"rendered":"http:\/\/blogs.reed.edu\/chem201202\/?p=5322"},"modified":"2014-09-22T13:31:34","modified_gmt":"2014-09-22T20:31:34","slug":"quiz-1-statistics-etc","status":"publish","type":"post","link":"https:\/\/blogs.reed.edu\/chem201202\/2014\/09\/quiz-1-statistics-etc\/","title":{"rendered":"Quiz #1 Statistics etc"},"content":{"rendered":"<p>69 students took Quiz #1 in-class last week and 59 students turned in take-home quizzes. Here are some statistics on how the class performed:<\/p>\n<ul>\n<li><strong>40-50 points<\/strong>. 13 students scored in this range on the in-class quiz. After considering take-home results, this number rose to 23 students.<\/li>\n<li><strong>30-39.5 points<\/strong>. 33 students scored in this range on the in-class quiz. After considering the take-home results, this number fell to 31 students (more students rose <em>out<\/em> of this group via the take-home than entered from below).<\/li>\n<li><strong>20-29.5 points.<\/strong> 18 students scored in this range on the in-class quiz. After considering the take-home results, this number fell to just 12 students.<\/li>\n<li><strong>10-19.5 points.<\/strong> 5 students scored in this range on the in-class quiz. After considering the take-home results, this number fell to just 3 students.<\/li>\n<\/ul>\n<p>As you can see, the take-home quiz appears to have given many students a boost (in fact, only 16 of 59 scored noticeably worse on the take-home quiz; see below). This data should strongly encourage anyone who wants to improve their understanding of the material (as well as their scores) to attempt the take-home quizzes.<\/p>\n<p>I also took a closer look at <em>how<\/em> students performed on the take-home and how this affected student scores.<!--more--><\/p>\n<p>Of the 59 students who took the take-home, 27 students saw their scores go up by a significant amount (arbitrarily defined as at least 2 points or 4%). 1 of these rising students had scored in the 40&#8217;s on the in-class quiz, but many more had begun with lower in-class scores: 30&#8217;s (14 students), 20&#8217;s (10 students), 10&#8217;s (2 students).<\/p>\n<p>Perhaps because a different grading policy was applied to the take-home and in-class quizzes, 16 students scored markedly <em>lower<\/em> on the take-home quiz (arbitrarily defined as a drop of greater than 2 points or 4%). These were mostly students who had done quite well on the in-class quiz: 40&#8217;s (5 students), 30&#8217;s (10 students), 20&#8217;s (1 student).<\/p>\n<p>Of course, when you begin with a high in-class score, it is simultaneously harder to raise your score via the take-home quiz and easier to see your take-home quiz score fall below what you achieved in-class (fortunately, you are not penalized by this). But it does demonstrate an important point: it is hard to write down &#8216;perfect&#8217; answers for <em>all<\/em> of the quiz problems. No one should <em>blindly<\/em> trust the answers provided by a classmate. Your comrades can point you in the right direction, but <em>you need to check for yourself<\/em> whether you are completely satisfied with each answer.<\/p>\n<p>For information on how these scores compare to last year&#8217;s class, how quiz scores typically change during the term, and how <em>I<\/em> think about quiz scores, please <a title=\"Some data (and advice) on exams | Chem 201\" href=\"https:\/\/blogs.reed.edu\/chem201202\/2013\/12\/reflections-on-exams\/#more-5006\"><strong>read this post<\/strong><\/a> from Dec 1, 2013.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>69 students took Quiz #1 in-class last week and 59 students turned in take-home quizzes. Here are some statistics on how the class performed: 40-50 points. 13 students scored in this range on the in-class quiz. After considering take-home results, this number rose to 23 students. 30-39.5 points. 33 students scored in this range on [&hellip;]<\/p>\n","protected":false},"author":55,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-5322","post","type-post","status-publish","format-standard","hentry","category-exams"],"_links":{"self":[{"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/posts\/5322","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/users\/55"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/comments?post=5322"}],"version-history":[{"count":1,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/posts\/5322\/revisions"}],"predecessor-version":[{"id":5323,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/posts\/5322\/revisions\/5323"}],"wp:attachment":[{"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/media?parent=5322"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/categories?post=5322"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/tags?post=5322"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}