Understanding Descriptive Statistics Quiz

What is the main purpose of descriptive statistics? 描述統計的主要目的是什麼？

Which of the following is a measure of central tendency? 下列哪一項是集中趨勢的量數？

What does the median represent in a data set? 中位數在資料集中代表什麼？

Which of the following is NOT a measure of dispersion? 下列哪一項不是離散量數？

If a data set has the values 2, 4, 4, 4, 5, 7, 9, what is the mode? 若資料集為 2, 4, 4, 4, 5, 7, 9，則眾數為何？

Which formula correctly calculates the mean of the numbers $$x_1, x_2, ..., x_n$$ ? 下列哪一個公式正確計算 $$x_1, x_2, ..., x_n$$ 的平均數？

Given the data set: 3, 7, 7, 19, 24, what is the range? 給定資料集：3, 7, 7, 19, 24，範圍（range）是多少？

A data set has the following values: 5, 8, 12, 15, 20. What is the median? 資料集為 5, 8, 12, 15, 20，中位數為何？

If the mean of a data set is 10 and the sum of all values is 50, how many values are in the data set? 若資料集的平均數為 10，所有數值的總和為 50，則資料集中有幾個數值？

Which of the following data sets has the greatest variability? 下列哪一個資料集的變異性最大？