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May 20th, 2010, 03:41 PM  #1 
Newbie Joined: May 2010 Posts: 1 Thanks: 0  Probability and Statistics help???
My math teacher is totally fail, and didn't manage to teach us a single thing all year. Now we're about at the end, and we have to do a few things to pass, and have no idea how. First section is rejecting claims and hypotheses and whatnot. Sample question: The dean of students wants to see wheteher there is a significant difference in ages of resident students and commuting students. She selects a sample of 50 students from each group. The ages are shown here. At ?=0.05, decide if there is enough evidence to reject the claim of no difference in the ages of the two groups. Use the standard deviations from the samples of the Pvalue method. Assume ?1 =3.68 and ?2 =4.7 Resident Students 22 25 27 23 26 28 26 24 25 20 26 24 27 26 18 19 18 30 26 18 18 19 32 23 19 19 18 29 19 22 18 22 26 19 19 21 23 18 29 18 22 21 19 21 21 22 18 20 19 23 Commuter Students 18 20 19 18 22 25 24 35 23 18 23 22 28 25 20 24 26 30 22 22 22 21 18 20 19 26 35 19 19 18 19 32 20 21 18 19 23 20 19 19 20 25 I have no idea how to do this and I can't graduate without, so if someone could logically say how to do it, I'd very much appreciate it. 
May 21st, 2010, 04:34 AM  #2 
Senior Member Joined: Apr 2008 Posts: 435 Thanks: 0  Re: Probability and Statistics help???
I'm afraid that we won't do this problem for you. But if you start, we can help you through it. The first question, I suppose, is do you know how to calculate the standard deviations? And, one you have that, can you perform the simple Ptest, or P value method, or whatever name you call it?


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