Definitions of population, sample, and parameter, descriptive and inferential statistics

Write a paragraph or two that defines and contrasts definitions of population, sample, and parameter, descriptive and inferential statistics?
Provide three examples of continuous variables and three examples of categorical variables.
Identify the independent and dependent variables in the following scenario: A counselor is interested in knowing if one of the two different treatments she is using with depressed clients is more effective in reducing measures of depression in them.