Pregunta: A study was designed to investigate the effects of two variables -(1) a student's level of mathematical anxiety and (2) teaching method-on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 470 with a standard

A study was designed to investigate the effects of two variables -(1) a student's level of mathematical anxiety and (2) teaching method-on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 470 with a standard deviation of 50 on a standardized test. Assuming no information concerning the shape of the distribution is known, what percentage of the students scored between 370 and 570? *** Se diseñó un estudio para investigar los efectos de dos variables: (1) el nivel de ansiedad matemática de un estudiante y (2) el método de enseñanza, en el rendimiento de un estudiante en un curso de matemáticas. A los estudiantes que tenían un bajo nivel de ansiedad matemática se les enseñó utilizando el método expositivo tradicional Estos estudiantes obtuvieron una puntuación media de 470 con una desviación estándar de 50 en una prueba estandarizada. Suponiendo que no se conoce información sobre la forma de la distribución, ¿qué porcentaje de estudiantes obtuvo una puntuación entre 370 y 570? OA approximately 68% / aproximadamente 68% OB at least 75 % / al menos 75% OC approximately 95% / aproximadamente 95% OD at least 88.9% / al menos 88.9%