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The difficulties that many students, particularly those in the social and behavioral sciences, encounter while taking an introductory statistics course have been widely reported in many parts of the world. Factors that have been purported as relating to performance in introductory statistics include a variety of cognitive and affective variables (Feinberg &(More)
The relation between congenital heart block and maternal connective-tissue disease was studied by antibody screening of serum samples obtained in connection with 45 cases of isolated congenital complete heart block. Serum was available from 41 mothers (17 who had connective-tissue disease and 24 who were healthy) and 21 children. Thirty-four mothers had(More)
An immunologic basis for congenital heart block has been proposed previously. To investigate the association between congenital heart block and maternal antibodies capable of crossing the placenta, we used immunofluorescence to examine serum samples from 41 mothers and 8 affected children, together with serum from controls, for antibodies to fetal cardiac(More)
A review of 34, 201 multigravid deliveries found 47 patients who had severe pre-eclampsia after previous normotensive, non-albuminuric pregnancies. In 13 of these patients the affected pregnancy was apparently by a new father compared with 3 matched controls (P less than 0.01). This evidence supports the idea of a paternal immunogenetic factor in(More)
A study of 1045 twin gestations with regard to known or likely zygosity and the incidence of pre-eclampsia/eclampsia failed to reveal differences between known dizygous twins and like-sex 'presumed' and 'estimated' monozygous twins except in the 'estimated' data for multigravidae. There was a threefold increase in the incidence for twins as opposed to(More)
The difficulties that many students encounter in introductory statistics courses have been widely reported. While many difficulties may be traced to conceptual and skill deficits in mathematics, some are attributed to non-cognitive factors such as students' attitudes about the subject. In addition to the potential for such attitudes to affect students'(More)