SWBAT: Construct and interpret dotplots, stemplots, and histograms.

SWBAT: Construct and interpret dotplots, stemplots, and histograms.

SWBAT: Construct and interpret dotplots, stemplots, and histograms. Dot Plot: above its Each data value is shown as a dot location on a number line. 1. Draw a horizontal axis (a number line) and label it with the variable name. 2. Scale the axis from the minimum to the maximum value. 3. Mark a dot above the location on the horizontal axis corresponding to each data value. EXAMPLE: How

good was the 2004 U.S. womens soccer team? With players like Brandi Chastain, Mia Hamm, and Briana Scurry, the team put on an impressive showing en route to winning the gold medal at the 2004 Olympics in Athens. Here are data on the number of goals scored by the team in 34 games played during the 2004 season SWBAT: Construct and interpret dotplots, stemplots, and histograms. When examining the distribution of quantitative variables look for patterns in: Shape: overall pattern of the data Symmetric: the right and left sides of the graph are approx. mirror images of each other Skewed: The direction of skewness is the direction of the long tail Skewed left Skewed right

Center: Spread: Point that divides the data roughly in half (median) The spread of a distribution tells us how much variability there is in the data. Range of values from smallest to largest. Outliers: A potential outlier is a value that stands out from the rest of the distribution SWBAT: Construct and interpret dotplots, stemplots, and histograms. EXAMPLE: The table below displays the EPA (Environmental Protection Agency) estimates of highway gas mileage in miles per gallon(mpg) for a sample of 24 model year 2009 midsize cars.

Describe: ShapeCenterSpreadOutliers- SWBAT: Construct and interpret dotplots, stemplots, and histograms. Stem Plot: Stemplots give us a quick picture of the small distribution while including the actual numerical values. 1. Separate each observation into a stem (all but the final digit) and a leaf (the final digit). 2. Arrange the leaves in increasing order out from the stem. 3.Provide a key explains in shoes context

what the stems and leaves EXAMPLE: Howthat many pairs of does a typical teenager have?represent. To find out, a group of AP Statistics students conducted a survey. They selected a random sample of 20 female students from their school. Then they recorded the number of pairs of shoes that each respondent reported having. Here are the data:

SWBAT: Construct and interpret dotplots, stemplots, and histograms. Splitting stems: A method for spreading out a stem plot that has too few stems. SWBAT: Construct and interpret dotplots, stemplots, and histograms. Back-to-back stem plot: Used to compare the distribution of a quantitative variable for two groups. EXAMPLE: The AP Statistics students in the previous example also collected data from a random sample of 20 male students at their school. Here are the numbers of pairs of shoes reported by each male in the sample: a) Create a stem plot of the data above.

b) Using the female data as well, lets create a back-to-back stem plot comparing males and females. SWBAT: Construct and interpret dotplots, stemplots, and histograms. Histogram: Displays the distribution of a quantitative variable 1. Divide the range of the data into classes of equal width 2. Find the count of individuals in each class 3. Label and scale your axes and draw the histogram EXAMPLE: The table below presents the data for all 50 states of the percent of residents who were born outside of the United States.

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