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Estudios estadísticos
Christine Belén Vidro
NUC University División en Línea
STAT 2000-3140ONL - Introduction to Statistics I
Profa. Rosita Robles Vázquez
3/21/2024
Ejercicio 1
Determina si la distribución dada corresponde a un estudio observacional o a un experimento. (4 puntos)
a.
A los pacientes se les administra Lipitor para determinar si este medicamento tiene el efecto de disminuir los altos niveles de colesterol.
experimento b.
Se realizó una encuesta a 1,000 adultos seleccionados al azar para identificar el número de tarjetas de crédito que tenían, el 30 % indicó que no tenían ninguna.
estudio observacional
c.
Un investigador entrevista a grupo aleatorio de clientes que entran a una farmacia muy concurrida para recolectar datos sobre el tiempo que tardan en ser atendidos en el recetario.
estudio observacional
d.
Un grupo de investigadores seleccionan una muestra de personas. Diferentes grupos de ellas reciben dosis distintas de un medicamento para la presión sanguínea y se recopila la información de la presión sanguínea previa y posterior para cada grupo
.
experimento
Ejercicio 2
Identifica el tipo de estudio observacional (transeccional, retrospectivo o prospectivo). (4 puntos)
a.
Un grupo de médicos estudió a residentes de la ciudad de Nueva York con y sin problemas respiratorios. Regresaron en el tiempo para determinar qué tan involucrados estuvieron en los ataques terroristas de la ciudad de Nueva York el 11 de septiembre de 2001. Retrospectivo
b.
El Departamento del Trabajo de Puerto Rico obtiene datos de desempleo reales encuestando a 50,000 personas en este mes.
Transeccional
c.
Un economista reúne datos entrevistando a personas que ganaron la lotería entre los años 1995 y 2000.
Retrospectivo
d.
Un estudio sobre la salud mental de los estudiantes universitarios inició el año 2000 con 150,000 estudiantes. El estudio está en curso.
prospectivo
Ejercicio 3
Para determinar el aprovechamiento académico de los estudiantes del noveno grado, la administración de una escuela recopiló los datos sobre el nivel del desempeño de un grupo particular en un periodo determinado. Los datos se recogen en la siguiente tabla. (17 puntos). Datos recopilados
Nivel de desempeño de estudiantes del noveno grado
alto
bajo
bajo
medio
medio
alto
medio
bajo
medio
alto
bajo
alto
bajo
medio
alto
medio
medio
bajo
alto
medio
medio
medio
alto
bajo
bajo
alto
medio
alto
alto
bajo
alto
medio
medio
medio
bajo
alto
alto
medio
bajo
medio
bajo
medio
medio
alto
alto
bajo
medio
bajo
a.
¿Qué tipo de variable se está manejando en este estudio? (2 puntos)
Cualitativa
b.
¿Cuál es el tamaño de la muestra? (2 puntos)
48
c.
Completa la tabla de distribución de frecuencias. (10 puntos)
Rendimiento
Frecuencia absoluta
Frecuencia
acumulada
Frecuencia relativa
Frecuencia relativa acumulada
Bajo
14
14
0.2917
0.2917
Medio
19
33
0.3958
0.6875
Alto
15
48
0.325
1.0000
Totales
48
1.0000
d.
Analiza la distribución de los datos y menciona tres conclusiones respecto al rendimiento académico de los estudiantes del noveno grado. (3 puntos)
La mayoría de los estudiantes se encuentran en los niveles medio y altos de desempeño, lo que indica que hay un buen número de estudiantes con rendimientos satisfactorios.
Los estudiantes con niveles de desempeño bajo se representan aproximadamente en el 29% de la muestra, lo que sugiere que un porcentaje significativo de estudiantes podría necesitar apoyo adicional para mejorar un rendimiento académico.
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Question 15 of 20 (1 point) Question Attempt: 1 of 1
Español
= 10
=11
= 12
= 13
14
15
18
20
A jet travels 5304 miles against the wind in 8 hours and 6424 miles with the wind in the same amount of time. What is the rate of the jet in still air and what is
the rate of the wind?
mi
Rate of the jet in still air:
5.
mi
Rate of the wind:
Submit Assignment
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