Scatter Plots Frequency Tables Histograms Line Plots Box

Scatter Plots Frequency Tables Histograms Line Plots Box and Whisker

Scatter Plot • A scatter plot is a graph of a collection of ordered pairs (x, y). • The graph looks like a bunch of dots, but some of the graphs are a general shape or move in a general direction.

• Positive Correlation, Negative Correlation or No Correlation

What is a Frequency Table? • A Frequency table is a table that lists each item in a data set with the number of times it occurs.

Construct a Frequency Table (tally sheet) 7, 10, 9, 8, 9, 7, 4, 3, 7, 10, 4, 8, 9, 6, 7, 10 Enter the data value into the 1 st column Data Value 0 1 2 3 4 5 6 7 8 9 10 Tally Frequency

Construct a Frequency Table (tally sheet) Count the tallies and put the total for each value in the frequency column Data Value Tally Frequency 0 1 2 3 4 1 2 5 6 1 7 4 8 2 3 9 10 4

Making a Line plot • What is the range? 7 • x • x x x • x x x x x 3 4 5 6 7 8 9 10

What is a Histogram? • A histogram is a bar graph with no spaces between the bars. The height of each bar shows the frequency of data within that interval. The intervals of a histogram are of equal size and do not overlap.

Histogram Frequency Class Test Scores

Histograms 95 flashlights are tested until they fail. The table gives the times taken ( hours ) until failure. Time to failure (hours) Number of components 0 -19 20 -29 30 -39 40 -44 45 -49 50 -59 60 -89 5 Find 2 or more things wrong with the histogram which represents the data in the table. 8 16 22 18 16 10

Histograms Answer: Time to failure (hours) 0 -19 Number of components 5 • There is no title. 20 -29 30 -39 40 -44 45 -49 50 -59 60 -89 8 16 22 18 16 10 Time taken for 95 components to fail • There are no units on the x-axis. Time to failure (Hours)

Histogram • Histograms are used to show the frequency of data. • Very similar to bar graphs, but use intervals on the X axis. • Bars do touch. • Histograms have a title. • Histograms have two axes which are labeled.

Enter the data into the calculator lists. Choose STAT, #1 EDIT and type in entries. Press 2 nd STATPLOT and choose #1 PLOT 1. You should see the screen at the right. Be sure the plot is ON, the second box-and-whisker icon is highlighted, and that the list you will be using is indicated next to Xlist. Freq: 1 means that each piece of data will be counted one time. Seeing the graph: To see the box-and-whisker plot, press ZOOM and #9 Zoom. Stat. Press the TRACE key to see on-screen data about the box-and-whisker plot.

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