Blog

Which hypothesis test do we use to test more than 2 samples for the equality of means?

Given the least squares regression equation, Y = 1,202 + 1,133X, when X = 3, what does Y equal?  

If r = 0.65, what does the coefficient of determination equal?  

A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. Assuming a population standard deviation of three hours, what is the required sample size if the error should be less than a half hour with a 99% level of confidence?

In what type of distribution is a z-score utilized?

What is this distribution called?

When all items in a population have an equal change of being selected, we are describing ___________________________ sampling.

The mean amount spent by a family of four on food is $500 per month with a standard deviation of $75. Assuming that the food costs are normally distributed, what is the probability that a family spends less than $410 per month?    

Todo trabajo entregado tarde perderá el 10% de los puntos posibles por cada día de retraso. Se hacen excepciones si notifica al/ a la instructor/asobre una tarea perdida o entregada tarde debido a una excusa legítima (enfermedades, visitas médicas obligatorias, actividades grupales aprobadas o solicitadas por la Universidad, y otras que cumplan con las políticas de WSU) y proporciona documentación escrita (por ejemplo, un certificado médico o una carta de certificación del tutor del estudiante) para respaldar su reclamación.    

Academic integrity only applies to major assignments, such as tests or essays.