Screen media usage, sleep time and socio-demographic features are related to adolescents' academic performance, but interrelations are little explored. This paper describes these interrelations and behavioral profiles clustered in low and high academic performance. A nationally representative sample of 3, Spanish adolescents, aged 12 to 18, was surveyed on 15 variables linked to the purpose of the study. A Self-Organizing Maps analysis established non-linear interrelationships among these variables and identified behavior patterns in subsequent cluster analyses.
Hypothesis Testing: Two sample means
South America is a continent entirely in the Western Hemisphere [note 6] and mostly in the Southern Hemisphere , with a relatively small portion in the Northern Hemisphere. It can also be described as a southern subcontinent of the Americas. The reference to South America instead of other regions like Latin America or the Southern Cone has increased in recent decades due to changing geopolitical dynamics in particular, the rise of Brazil. South America has an area of 17,, square kilometers 6,, sq mi. Its population as of [update] has been estimated at more than million.
After signing with Def Jam in , she soon gained recognition with the release of her first two studio albums, Music of the Sun and A Girl like Me , both of which were influenced by Caribbean music and peaked within the top ten of the US Billboard chart. Rihanna's third album, Good Girl Gone Bad , incorporated elements of dance-pop and established her status as a sex symbol in the music industry. The chart-topping single " Umbrella " earned Rihanna her first Grammy Award and catapulted her to global stardom. Her eighth album, Anti , showcased a new creative control following her departure from Def Jam. It became her second US number-one album and featured the chart-topping single " Work ".
Educational technology commonly abbreviated as EduTech , or EdTech is the combined use of computer hardware, software, and educational theory and practice to facilitate learning. In addition to practical educational experience, educational technology is based on theoretical knowledge from various disciplines such as communication, education, psychology, sociology, artificial intelligence, and computer science. The Association for Educational Communications and Technology AECT defined educational technology as "the study and ethical practice of facilitating learning and improving performance by creating, using and managing appropriate technological processes and resources". Educational technology is the process of integrating technology into education in a positive manner that promotes a more diverse learning environment and a way for students to learn how to use technology as well as their common assignments.