Blog

The subset function is used to pick out parts of a data frame that meet certain criteria.

A sample with more variability would result in a smaller confidence interval.

You want to analyze the relationship between two variables that are not normally distributed. What statistical test is most appropriate?

To quantitatively determine if the variable describing Alex Morgan’s number of goals per season is normally distributed, what R function would you use?

You are working with a very large data frame name “socioeco” and want to pick out just the value in row 3 and column 3 and save it as variable “z”. What code snippet would accomplish this?

is the empty hypothesis that describes a finding of no difference and is assumed to be true until there is substantial evidence to reject it.

In our dataset there is a variable for streamflow that exhibits negative skew. This tells us that the: 

For our temperature variable, the mean is 20 degrees Celsius and the standard deviation is 5 degrees Celsius. What is the coefficient of variation? Formula: CV = s / x̅ 

Hypothesis testing is a single step procedure used to prove if something is true.

Why do we often use samples in statistics?