Comments for roughlynormal
https://roughlynormal.com
about teaching statistics, math, and other stuffWed, 22 Jun 2016 23:34:22 +0000hourly1http://wordpress.com/Comment on My Possible Solutions: 2016 AP Statistics Free Response Questions by roughlynormal
https://roughlynormal.com/2016/05/14/my-possible-solutions-2016-ap-statistics-free-response-questions/#comment-10870
Wed, 22 Jun 2016 23:34:22 +0000http://roughlynormal.com/?p=150625#comment-10870Agreed!
]]>Comment on My Possible Solutions: 2016 AP Statistics Free Response Questions by Say What
https://roughlynormal.com/2016/05/14/my-possible-solutions-2016-ap-statistics-free-response-questions/#comment-10852
Tue, 24 May 2016 17:27:34 +0000http://roughlynormal.com/?p=150625#comment-10852in 4b you desire a failure in the 31st or 32nd launch. Another way to think of this is you don’t want two successful launches. Thus 1 – .85^2 = 0.2775. You have ignored the case of two failures which would still satisfy the requirement of first failure on 31st or 32nd launch.
]]>Comment on My Possible Solutions: 2016 AP Statistics Free Response Questions by roughlynormal
https://roughlynormal.com/2016/05/14/my-possible-solutions-2016-ap-statistics-free-response-questions/#comment-10847
Thu, 19 May 2016 17:54:55 +0000http://roughlynormal.com/?p=150625#comment-10847Thank you! I will fix this in my next draft.
]]>Comment on My Possible Solutions: 2016 AP Statistics Free Response Questions by Worth Swearingen
https://roughlynormal.com/2016/05/14/my-possible-solutions-2016-ap-statistics-free-response-questions/#comment-10846
Thu, 19 May 2016 17:25:46 +0000http://roughlynormal.com/?p=150625#comment-10846There’s a typo in question 4b. 0.15 + (0.85)(0.15) instead of (0.85)(0.15)+(0.85)(0.15). You have the same answer I do so I’m pretty sure yours is a typo.
]]>Comment on Possible Solutions, 2015 AP Statistics free response questions, Draft 2 by Jack
https://roughlynormal.com/2015/05/17/possible-solutions-2015-ap-statistics-free-response-questions-draft-2/#comment-9535
Wed, 20 May 2015 00:01:27 +0000http://roughlynormal.com/?p=149820#comment-9535Small detail on number 2 part c on draft 2- it reads that it provides convincing evidence p doesn’t equal 0.02 when it should be it provides convincing evidence p doesn’t equal 0.2.
]]>Comment on Possible Solutions, 2015 AP Statistics free response questions, Draft 2 by mickeyyogi
https://roughlynormal.com/2015/05/17/possible-solutions-2015-ap-statistics-free-response-questions-draft-2/#comment-9533
Tue, 19 May 2015 16:41:20 +0000http://roughlynormal.com/?p=149820#comment-9533I agree with your answers. With regard to number 6, I thought perhaps one could estimate the daily standard deviation for method 1 through the histogram with the values given at bottom of the graph. Given the daily standard deviation off all (.11) and thus resulting variance, then one could solve for the standard deviation of method 2 by working with the sum of variances (given my approximation from the histogram) and solving the resulting equation. Repeating the process, and assuming the standard deviation for both the 5.9 day and 6.1 day would be the same, then one could come up with the standard deviation for each. It gave mathematical verification to my answers which agreed with your analysis. Simple idea from an algebra teacher who somehow got stuck teaching AP Stat.
]]>Comment on Stay Tuned: My attempts at 2015 AP Statistics Free Response solutions coming soon! by roughlynormal
https://roughlynormal.com/2015/05/13/stay-tuned-my-attempts-at-2015-ap-statistics-free-response-solutions-coming-soon/#comment-9530
Mon, 18 May 2015 19:38:19 +0000http://roughlynormal.com/?p=149760#comment-9530Thanks John: I will fix these in the next draft.
]]>Comment on Possible Solutions to 2015 AP Statistics Exam questions, draft 1 by roughlynormal
https://roughlynormal.com/2015/05/16/possible-solutions-to-2015-ap-statistics-exam-questions-draft-1/#comment-9529
Mon, 18 May 2015 19:37:45 +0000http://roughlynormal.com/?p=149803#comment-9529Thanks David! Good point.
]]>Comment on Possible Solutions to 2015 AP Statistics Exam questions, draft 1 by David
https://roughlynormal.com/2015/05/16/possible-solutions-to-2015-ap-statistics-exam-questions-draft-1/#comment-9528
Mon, 18 May 2015 19:32:26 +0000http://roughlynormal.com/?p=149803#comment-9528Thanks for the work you have put into this and making this space for discussion! Great for a first year teacher like me. I don’t mean to nit pick, but in 1a, I think the outliers should be described as “5-year employees” instead of “entry level employees” to convey an understanding between the 2009 and 2014 contexts of this problem.
]]>Comment on Stay Tuned: My attempts at 2015 AP Statistics Free Response solutions coming soon! by John Unson
https://roughlynormal.com/2015/05/13/stay-tuned-my-attempts-at-2015-ap-statistics-free-response-solutions-coming-soon/#comment-9527
Mon, 18 May 2015 19:23:55 +0000http://roughlynormal.com/?p=149760#comment-9527Thanks for these potential solutions. I agree with your answers with the following exceptions: Shouldn’t the expected value for #3d be 1.998, taking into account the conditional probs for 3 given at least 1 (0.2824) and 2 given at least 1 (0.4706) being applied to the values of 3 and 2 respectively and added to the 0.21 from 1 ATM? Also, the mechanics portion of #4 is missing the 1 minus p-hat value of 959/1000 in the calculation of the sigma value. Great to be able to compare solutions with others who have taught this course for the past 17 years!
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