Aprendizaje y enseñanza del contraste de hipótesis : concepciones y errores

In spite of the numerous references to problems derived from the incorrect use of the statistical tests or from misinterpretations of their results by experimental researchers in different areas, the educational world has stayed until the moment detached from them. In this paper we present the results of a wide research aiming at carring out a comprehensive evaluation of the learning of the hypothesis test by undergraduates. We point to some difficulties and errors that might underlie the origin of the denounced problems and that the teaching will have to take into account for an improvement of the learning of the topic. Likewise, we describe students' conceptions about two key concepts in statistical test: the logical structure of hypothesis testing and the level of significance

Genetic Analysis of the Fatty Acid Profile in Gilthead Seabream (Sparus aurata L.).

The gilthead seabream is one of the most valuable species in the Mediterranean basin both for fisheries and aquaculture. Marine fish, such as gilthead seabream, are a source of n3 polyunsaturated fatty acids, highly appreciated for human food owing to their benefits on the cardiovascular and immune systems. The aim of the present study was to estimate heritability for fatty acid (FA) profile in fillet gilthead seabream to be considered as a strategy of a selective breeding program. Total of 399 fish, from a broodstock Mediterranean Sea, were analysed for growth, flesh composition and FA profile. Heritabilities for growth traits, and flesh composition (fat, protein, and moisture content) were medium. Heritability was moderate for 14:0, 16:0 and 18:1n9 and for sum of monounsaturated FA and n6/n3 ratio, and it was low for 20:1n11 and 22:6n3 and the ratio unsaturated/saturated FA. Breeding programs in gilthead seabream usually include growth as the first criterion in the selection process of the fish. However, other quality traits, such as fillet fat content and its fatty acids profile should be considered, since they are very important traits for the consumer, from a nutritional point of view and the benefits for the health.Versión del edito

Acute retroperitoneal bleeding due to inferior mesenteric artery aneurysm: Case report

<p>Abstract</p> <p>Background</p> <p>Visceral artery aneurysms (VAA), although uncommon, are increasingly being detected. We describe a case of spontaneous retroperitoneal hemorrhage from a ruptured IMA aneurysm associated with stenosis of the superior mesenteric artery (SMA) and celiac trunk, successfully treated with surgery.</p> <p>Methods</p> <p>A 65-year-old man presented with abdominal pain and hypovolemic shock. Abdominal CT scan showed an aneurysm of the inferior mesenteric artery with retroperitoneal hematoma. In addition, an obstructive disease of the superior mesenteric artery and celiac axis was observed.</p> <p>Results</p> <p>Upon emergency laparotomy a ruptured inferior mesenteric artery aneurysm was detected. The aneurysm was excised and the artery reconstructed by end-to-end anastomosis.</p> <p>Conclusions</p> <p>This report discusses the etiology, presentation, diagnosis and case management of inferior mesenteric artery aneurysms.</p

El análisis de datos como útil y objeto de la didáctica de la matemática

En los trabajos de índole etnoestadística sobre investigaciones en ciencias sociales y experimentales se ha puesto de manifiesto la existencia de dificultades y errores en la aplicación de los conceptos y procedimientos estadísticos. Debido a la naturaleza matemática de los conceptos y a los procesos didácticos implicados, en este trabajo analizamos el interés de abordar, desde la perspectiva de la Didáctica de la Matemática, estudios sistemáticos sobre esta problemática

Aprendizaje y enseñanza del contraste de hipótesis : concepciones y errores

In spite of the numerous references to problems derived from the incorrect use of the statistical tests or from misinterpretations of their results by experimental researchers in different areas, the educational world has stayed until the moment detached from them. In this paper we present the results of a wide research aiming at carring out a comprehensive evaluation of the learning of the hypothesis test by undergraduates. We point to some difficulties and errors that might underlie the origin of the denounced problems and that the teaching will have to take into account for an improvement of the learning of the topic. Likewise, we describe students' conceptions about two key concepts in statistical test: the logical structure of hypothesis testing and the level of significance