distribution of mean differences (sampling distribution for paired samples t-test)

What is the ratio of the between-groups variance to the within-groups variance?

Which of the following will give you more power in a paired samples t-test? 

What is the total sum of squared deviations of each score around the means?

distribution of differences between means (sampling distribution for independent samples t-test)

In order to estimate the average cell phone minutes per day for teens throughout the U.S., you compute the mean cell phone minutes per day for 500 teens. All U.S. teens are the [answer1], the 500 teens are the [answer2], the average cell phone minutes per day throughout the U.S. is the [answer3], and the mean cell phone minutes per day the 500 teens is the [answer4].

Cuéntame de lo que hiciste durante el verano. Asegúrate de incluir detalles del ambiente y de los personajes del cuento. Debe de ser al menos unos 100 palabras.

How many participants were included in this analysis?

What is the interpretation of a Cohen’s d of -1.33? 

What is the chance of getting means that vary as much as these by chance if the null is true and they all come from the same population?