STANDARD: 8.SP.2 STATISTICS AND PROBABILITY: SCATTER PLOTS.

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Presentation transcript:

STANDARD: 8.SP.2 STATISTICS AND PROBABILITY: SCATTER PLOTS

Review: One variable data: a data set that contains measures of only one trait or quantity Two variable data : data that contains measures of ________ traits to try to find a relationship. Scatter plot : a graph that displays the ____________ data in a graphic form. SCATTER PLOTS: LINE OF BEST FIT

Line of best fit: a line of best fit can be made by drawing a line through or between the points making sure to: A)Follow the general direction of the data points AND B) Make sure that there are about the same number of points above the line as below the line. SCATTER PLOTS: LINE OF BEST FIT

Once a scatterplot has been graphed, the information on the graph can then be interpreted. Illustration of scatter plots with various properties: (a) 'shotgun' scatter, with low association, (b) strong positive association, (c) strong negative association, (d) and (e) low association, with very little change in one variable compared with the other, SCATTER PLOTS: LINE OF BEST FIT

What is the line of best fit for each of these graphs? Why? SCATTER PLOTS: LINE OF BEST FIT

Does an outlier affect a line of best fit? SCATTER PLOTS: LINE OF BEST FIT

Some two variable graphs bunch up together…this is called a cluster. SCATTER PLOTS: LINE OF BEST FIT

1)Take out the work you presented the previous day. 2)Find your line of best fit 3)Meet with your partners from the previous day and share what you drew as the line of best fit. Are there similarities? Differences? 4)Now, find a partner. Explain to your partner what your line of best fit looks like and why you chose it drawn the way you did. SCATTER PLOTS: LINE OF BEST FIT