Determine what the key terms refer to in the following study. We want to know the average (mean) amount of money spent on school uniforms each year by families with children at Knoll Academy. We randomly survey 100 families with children in the school. Three of the families spent $\backslash (65$, $\backslash )75$, and $\$95$, respectively.

Population : The population is all the families with children at Knoll Academy .

Sample : The sample could be all students enrolled in one section of a course at Knoll Academy. (although this sample may not represent the entire population).

Parameter: The parameter is the average (mean) amount of money spent on school uniforms each year by families with children at Knoll Academy.

Statistic : The statistic is the average (mean) amount of money spent on school uniforms each year by families with children at Knoll Academy in the sample .

The variable could be the amount of money spent on school uniforms each year by one family with children at Knoll Academy.

Let X = the amount of money spent by one family with children attending Knoll Academy.

The data are the dollar amounts spent by the families. Examples of the data are .