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 College Confidential 2011 AP Statistics Thread
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 05-11-2011, 12:04 AM #76 Junior Member   Join Date: Apr 2010 Posts: 123 my teacher told us not to worry about calculating power and Type II errors, but he said to know what each error was and be able to apply them in context Reply
 05-11-2011, 12:06 AM #77 New Member   Join Date: Apr 2010 Posts: 23 Okay thanks! That's a relief. Reply
 05-11-2011, 12:07 AM #78 Junior Member   Join Date: Dec 2010 Posts: 74 @anotherindiankid: what troubles do you have with binomial and geometric? I get the gist of it being that binomial distribution has a mean of np (sample size times population proportion), standard deviation as sqrt(np(1-p)), and the pdf measures the probability of an exact number of trials. Geometric probability should be used for questions that ask for the first time a success should occur. Reply
 05-11-2011, 12:08 AM #79 Junior Member   Join Date: Dec 2010 Posts: 74 what's the difference between p-hat and p? (sample proportions) Reply
 05-11-2011, 12:08 AM #80 Junior Member   Join Date: Apr 2010 Posts: 123 yea i understand the calculations, but i don't know when to use which one. so, use geometric when they ask for the first time a success occurs? and when do you use binomials? Reply
 05-11-2011, 12:09 AM #81 Junior Member   Join Date: Apr 2010 Posts: 123 isnt p the parameter (for the population) and p hat the statistic (for the sample)? Reply
 05-11-2011, 12:13 AM #82 Member   Join Date: Aug 2010 Posts: 353 Geometric is when you do something UNTIL you get a success. Binomial is when you calculate the number of successes in a GIVEN number of trials. Does that make sense? Reply
 05-11-2011, 12:14 AM #83 Member   Join Date: Aug 2010 Posts: 353 Can someone explain chi square vs chi square GOF? Like when to use them? Reply
 05-11-2011, 12:16 AM #84 Junior Member   Join Date: Dec 2010 Posts: 74 from what i'm reading, parameters and statistics are synonymous to a measurement of a proportion? what i'm confused about is why they'd talk about p hat and then suddenly use p for finding mean and standard deviation for p hat Here's an example that might help clear things up in binomial (i'm still confused about cdf!) A manager notes that there is a .125 probability that any employee will arrive late for work. What is the probability that exactly one person is in a six person department will arrive late? Note the key word: "exactly" one person So...binompdf(n,p,x) -> binompdf(6,.125,1)= .385 Reply
 05-11-2011, 12:19 AM #85 Junior Member   Join Date: Apr 2010 Posts: 123 ok i understand that but i dont understand #26 and 27 on here: AP Statistics Practice Exam 2 | Education.com like, i dont even know how to start Reply
 05-11-2011, 12:20 AM #86 Member   Join Date: Aug 2010 Posts: 353 the "c" stands for cumulative, so you used a PDF there because of the word "exactly" Reply
 05-11-2011, 12:21 AM #87 Junior Member   Join Date: Dec 2010 Posts: 74 Can anyone tell me the difference between a sampling proportion and a sample mean? Reply
 05-11-2011, 12:24 AM #88 Junior Member   Join Date: Apr 2010 Posts: 123 yea a sampling proportion is x/n but a sample mean is when you're finding a specific value right? basically, it depends on what you want to find out i think. like if you want to find out the mean length of all fish, you would do a sample and find the sample mean. if you wanted to find out if cell phones or passengers distracted drivers more, you would find the proportions in the sample. Reply
 05-11-2011, 12:25 AM #89 Junior Member   Join Date: Apr 2010 Posts: 123 oh and sample mean is x bar, sample proportion is p hat population mean is mu and pop. proportion is p Reply
 05-11-2011, 12:28 AM #90 Member   Join Date: Aug 2010 Posts: 353 Is there an answer key for that test anywhere? (for number 26 & 27) Reply

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