Bellwork: Monday

Measures of Central Tendencies/ Box and Whisker Plots

Measures of Central Tendencies Video: https://www.youtube.com/watch?v=B1HEzNTGeZ4

-------------Inter Quartile Range------- (IQR) Box and Whisker plot This data represents the ages of people at a party. There are 20 people at the party All quartiles (sections) have the same number of data points (4 people fall in each section) Median Minimum Lower Extreme Maximum Upper Extreme 25% 25% 25% -------------Inter Quartile Range------- (IQR) 25% Lower Quartile (Q1) Upper Quartile (Q3)

Definitions Range Example: 29 – 7 =22 greatest value – least value Example: 29 – 7 =22 Interquartile Range- (variability) the upper quartile – lower quartile (the range of the box) Example: 26 – 14.5 =11.5 Measures of Center- Mean and Median Only can find MEDIAN on a box and whisker plot Median the middle number when data is ordered least to greatest Example: Median= 20.5 Mean= CANNOT FIND!!!

Dot Plot Range Example: 5 - 0= 5 Mean Median Mode greatest value – least value Example: 5 - 0= 5 Mean The average (add up all the values and divide by the number of values in the data set Example: 0 + 2 + 2 + 3 + 3 + 3 + 4 + 5 + 5 = 3 9 Median the middle number when data is ordered least to greatest Example: Median= 3 Mode the most often occurring

Questions

Bellwork: Tuesday

Comparing Data: Notes

Comparing What information can you get from a dot plot that you cannot get from a box and whisker plot? What information can you get from looking at a box and whisker plot that is not given in a dot plot? What information is given on both a dot plot and a box and whisker plot?

Instruction Book Page 274-275

Example:

Instruction Book Page 270

Instruction Book Page 278

Bellwork: Wednesday

Examples

10

(HINT: Mean and Median)

Bellwork: Thursday

Random Samples 7. SP.1 Understand that statistics can be used to gain information about a population by examining a sample of the population; generalizations about a population from a sample are valid only if the sample is representative of that population. Understand that random sampling tends to produce representative samples and support valid inferences.

Instruction Book Page 248 Have out a highlighter

Instruction Book Page 249 Random Sample Write in: **A random sample represents the whole population**

Biased Sample Write in: **Biased sample does not represent the whole population**

Instruction Book Page 250

Instruction Book Page 251

Bellwork: Friday Have out a piece of paper and a pencil for a Bellwork quiz.

Bellwork Quiz