{"action":"created","issue":{"url":"https://api.github.com/repos/maths/moodle-qtype_stack/issues/242","repository_url":"https://api.github.com/repos/maths/moodle-qtype_stack","labels_url":"https://api.github.com/repos/maths/moodle-qtype_stack/issues/242/labels{/name}","comments_url":"https://api.github.com/repos/maths/moodle-qtype_stack/issues/242/comments","events_url":"https://api.github.com/repos/maths/moodle-qtype_stack/issues/242/events","html_url":"https://github.com/maths/moodle-qtype_stack/issues/242","id":180553224,"number":242,"title":"Odd Rounding Feedback","user":{"login":"jmbragg","id":4606870,"avatar_url":"https://avatars.githubusercontent.com/u/4606870?v=3","gravatar_id":"","url":"https://api.github.com/users/jmbragg","html_url":"https://github.com/jmbragg","followers_url":"https://api.github.com/users/jmbragg/followers","following_url":"https://api.github.com/users/jmbragg/following{/other_user}","gists_url":"https://api.github.com/users/jmbragg/gists{/gist_id}","starred_url":"https://api.github.com/users/jmbragg/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jmbragg/subscriptions","organizations_url":"https://api.github.com/users/jmbragg/orgs","repos_url":"https://api.github.com/users/jmbragg/repos","events_url":"https://api.github.com/users/jmbragg/events{/privacy}","received_events_url":"https://api.github.com/users/jmbragg/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":12,"created_at":"2016-10-03T02:35:54Z","updated_at":"2016-10-14T09:37:26Z","closed_at":null,"body":"![weird rounding feedback](https://cloud.githubusercontent.com/assets/4606870/19026155/5737be38-88f0-11e6-9b1b-7e264e2372b1.PNG)\r\n\r\nCan you tell me what triggers the \"The accuracy of your answer is not correct. Either you have not rounded correctly, or you have rounded an intermediate answer which propagates an error.\" part of this feedback message?  Its confusing students in scenarios similar to this one because they think they've got the answer correct, except for the rounding when in reality they're just wrong."},"comment":{"url":"https://api.github.com/repos/maths/moodle-qtype_stack/issues/comments/253754394","html_url":"https://github.com/maths/moodle-qtype_stack/issues/242#issuecomment-253754394","issue_url":"https://api.github.com/repos/maths/moodle-qtype_stack/issues/242","id":253754394,"user":{"login":"sangwinc","id":781615,"avatar_url":"https://avatars.githubusercontent.com/u/781615?v=3","gravatar_id":"","url":"https://api.github.com/users/sangwinc","html_url":"https://github.com/sangwinc","followers_url":"https://api.github.com/users/sangwinc/followers","following_url":"https://api.github.com/users/sangwinc/following{/other_user}","gists_url":"https://api.github.com/users/sangwinc/gists{/gist_id}","starred_url":"https://api.github.com/users/sangwinc/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sangwinc/subscriptions","organizations_url":"https://api.github.com/users/sangwinc/orgs","repos_url":"https://api.github.com/users/sangwinc/repos","events_url":"https://api.github.com/users/sangwinc/events{/privacy}","received_events_url":"https://api.github.com/users/sangwinc/received_events","type":"User","site_admin":false},"created_at":"2016-10-14T09:37:26Z","updated_at":"2016-10-14T09:37:26Z","body":"Thanks Matti, David,\r\n\r\nYou are correct to remind us all of the dangers of changing existing functionality, as is David that we should strive to get this all \"right\"!\r\n\r\nWe could address the first of these by saying that we have \"StrictSigFigs\" for a very strict interpretation, (100 has 1 sig fig, 1.00e2 has 2)  and keep \"SigFigs\" for the current (more liberal) situation (100 to 3 sig figs is not marked \"wrong\").  Even if we do this, the current test does not deal well with trailing zeros and I think we should seek to improve this.\r\n\r\nIs anyone aware of research in the physics education literature about students' and teachers' understanding of these issues?  It occurs to me this must be a serious issue which has attracted research effort to understand before.  We should look at this before we rush to code...\r\n\r\nChris"}}
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