SkyDaemon 0 #1 April 26, 2006 Well, I'm trying to figure out some mathematical statistics and am having a hard time with some of them. Unfortunately it's one of those sciences that few people know. I was curious if anyone could give me a hand. I'd really appreciate it. Here's one of the questions: The average SAT score in mathematics is 483 with a standard deviation of 100. An ad for a special preparation course claims that this course can increase mathematics SAT scores. A sample of 32 students completed this course and took the mathematics SAT getting a mean score of 494. At an alpha of .05, does this course do what it claims?find / -name jumpers -print; cat jumpers $USER > manifest; cd /dev/airplane; more altitude; make jump; cd /pub; more beer; Quote Share this post Link to post Share on other sites
Icon134 0 #2 April 26, 2006 Disturbingly enough I do actually know how to answer this question... I don't want to though... Livin' on the Edge... sleeping with my rigger's wife... Quote Share this post Link to post Share on other sites
n23x 0 #3 April 26, 2006 Ho: MUb-MUa <= 0 Hi: MUb-MUa > 0 Given: 494-483 = 11 s = 100 n=32 Test level = 5% (11-0)/(100/SQRT(32))=z z= -.62 My Normal Dist z table says that equals p=1-F(z)=1-.2676=0.7324? Since that P is way the hell bigger than 0.05 Test Level (alpha) Ho is rejected and we conclude that Hi is correct? It's my best guess. I'm a dummy, I quit. .jim"Don't touch my fucking Easter eggs, I'll be back monday." ~JTFC Quote Share this post Link to post Share on other sites
popsjumper 2 #4 April 26, 2006 Quote...Unfortunately it's one of those sciences that few people know.... Jeez...you got that right...good luck. Does ths have anything to do with the aquare of the hypotenuse? <...if I only had a brain...>My reality and yours are quite different. I think we're all Bozos on this bus. Falcon5232, SCS8170, SCSA353, POPS9398, DS239 Quote Share this post Link to post Share on other sites
mmytacism 0 #5 April 26, 2006 You're right, except that the p-value has to be less than .05, not greater than it, to reject the null hypothesis (h0). Since p is way the hell bigger than .05, you can't reject h0. In lay terms, that means that the kids who took the SAT course did not perform significantly better than average (494 > 483, but not significantly in this case). I think... Quote Share this post Link to post Share on other sites
ChrisL 2 #6 April 26, 2006 My results say "Screw the SAT" __ My mighty steed Quote Share this post Link to post Share on other sites
n23x 0 #7 April 26, 2006 D'Oh! .jim"Don't touch my fucking Easter eggs, I'll be back monday." ~JTFC Quote Share this post Link to post Share on other sites
