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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%" height="26">Autor</th> <th class="thCornerR">Wiadomość</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>john2072</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/xeon/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Wysłany: Śro 10:03, 09 Mar 2011<span class="gen"> </span> Temat postu: measure of variability = square root of [</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">y“measure of variability” which is called the <br />stan- <br />dard error of the difference in two means.In other words: <br />measure of variability = square root of [(SEM1)2+ (SEM2)2] <br />4.A 95% con?dence interval for the difference in the two population means is <br />difference in sample means ±2 ×measure of variability <br />or <br />difference in sample means ±2 ×square root of [(SEM1)2+(SEM2)2] <br />This format was based on the fact that the “sample value” over repeated samples was <br />predicted to follow a bell-shaped curve centered on the “population value.” All we <br />needed to know in addition was the “standard deviation” for that speci?c bell-shaped <br />curve. <br />The same is true for calculating the difference in two means. Here is the recipe <br />you follow: <br />A DIRECT COMPARISON OF DIET AND EXERCISE <br />We are now in a position to compute a 95% con?dence interval for the difference <br />in population means for weight loss from dieting only and weight loss from exer- <br />cising only. Let’s follow the steps outlinedusing the data from the previous section: <br />Steps 1 and 2pute sample meansstandard deviationsand SEMs: <br />Diet OnlyExercise Only <br />sample mean = 7.2 kgsample mean = 4.0 kg <br />sample standard deviation = 3.7 kgsample standard deviation = 3.9 kg <br />number of participan <span style="font-weight: bold"><a href="http://www.christianlouboutinshoesaled.com/index.html" target="_blank" class="postlink">christian louboutin pump</a></span>yilai: <br /><a href="http://www.jordanheelsoutlet.com" target="_blank" class="postlink"><span style="font-weight: bold">nike high heels</span></a> <br /><a href="http://www.jordanheelsoutlet.com" target="_blank" class="postlink"><span style="font-weight: bold">nike heels for women</span></a> <br /><a href="http://www.louisvuittonoutlethotsale.com" target="_blank" class="postlink"><span style="font-weight: bold">louis vuitton outlet</span></a> <br /> <br /> <br /> <a href="http://leetstreams.com/profile_blogs/yixian005/&action=view&id=193098" target="_blank" class="postlink">http://leetstreams.com/profile_blogs/yixian005/&action=view&id=193098</a></span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="http://picsrv.fora.pl/xeon/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> </table>
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