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In spring 2002 , redesign students ’ scores were significantly higher than traditional students ’ scores for two of the six learning objectives ; for the other four learning objectives and overall scores , there were no significant differences between the means of redesign and traditional students . Overall , though , there 's no significant change , positive or negative , in keystroke efficiency . As operationalized by the Sense of Classroom Community Index ( SCCI ) , there appears no significant difference in classroom community between the two groups of subjects . For practical purposes , there 's no significant difference between different NaN values in XEmacs Lisp , and there 's no rule for precisely which NaN value should be used in a particular case , so this manual does n't try to distinguish them . In each case , there was no significant improvement in grades or test scores ; at Newport Middle School , discipline referrals for the boys soared . " However , " for wives , there 's no significant relationship between how aroused they are and how badly they feel . For practical purposes , there 's no significant difference between different NaN values in Emacs Lisp , and there 's no rule for precisely which NaN value should be used in a particular case , so this manual does n't try to distinguish them . In a study by Wegner and others , there appears no significant difference in test scores between the students enrolled in the traditional classroom and those enrolled in the online computer course despite the fact that the online computer course students did not attend a single on-campus lecture [ 6 ] . In a post hoc subgroup analysis , there was no significant difference between vaccine and placebo recipients with regard to development of musculoskeletal events ( defined as arthritis , arthropathy , arthrosis , synovitis , tendinitis , polymyalgia rheumatica , bursitis or rheumatoid arthritis and lasting more than 30 days ) in those with a prior history of musculoskeletal conditions . Looking at the effects of font on legibility distance , there was no significant difference in the daytime legibility distances obtained with the Series E ( M ) font and the Clear 100 and Clear 112 fonts . Thus , there appeared no significant collapse , even though the experimenter had enough information to derive from the seed numbers , in principle , the finally displayed binary sequence . Contrary to expectation , there were no significant differences between non-smokers , moderate smokers , and heavy smokers across most of the 14 major medical systems assessed . Within these regions , there were no significant differences between the contrast group and the health controls . After an average follow-up of 3.9 years , there was no significant reduction of cardiac events , defined as death , heart attack , unstable angina , angioplasty or cardiac surgery , among participants receiving antibiotic compared to those given placebo . With respect to school return , there was no significant difference between the two groups . At the same time , there were no significant impacts on either fuel economy or performance of the vehicles .