Descriptive Statistics

1
Lesson 2.1

• Descriptive Statistics

2
Objectives

• This is an introduction to Summation Notation.
• We will use the formulas described for the rest
  of the quarter.
• Our Goals are
• To understand and perform the basic rues of
  Summation Notation.
• Display Data using
• an Array
• a Stemplot
• a Simple Frequency Distribution
• a Grouped Frequency Distribution
• and a Histogram

3
Notations

• S the SUM of a set
• SX SUM all Xs
• SX2 Square each X and then SUM
• (SX)2 SUM all Xs and then Square
• (SX)(SY) SUM all Xs, SUM all Ys then Multiply
  totals
• SXY Multiply each X by the corresponding Y,
  then SUM the totals

• n Sample size
• N Population size
• s the Population Mean
• X the Sample Mean