Core - Statistics

    Chapter 2

    Summarizing and Visualizing Data

    2.1 : Review and Preview01:13

    2.1 : Review and Preview

    Data are individual items of information obtained from a population or sample. Data may be classified as qualitative (categorical), quantitative ...

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    2.2 : What is a Frequency Distribution00:51

    2.2 : What is a Frequency Distribution

    A frequency is the number of times a value of the data occurs. The sum of all the frequency values represents the total number of students included in the ...

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    2.3 : Construction of Frequency Distribution01:15

    2.3 : Construction of Frequency Distribution

    A frequency distribution table can be constructed using the steps given below. First, make a table with two columns—one with the title of the data ...

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    2.4 : Relative Frequency Distribution00:55

    2.4 : Relative Frequency Distribution

    A relative frequency distribution is the proportion or fraction of times a value occurs in a data set. To find the relative frequencies, one can divide ...

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    2.5 : Percentage Frequency Distribution00:57

    2.5 : Percentage Frequency Distribution

    A percentage frequency distribution, in general, is a display of data that indicates the percentage of observations for each data point or grouping of ...

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    2.6 : Cumulative Frequency Distribution01:04

    2.6 : Cumulative Frequency Distribution

    A cumulative frequency distribution is another type of frequency distribution. Instead of reporting how many data values fall in some classes, it reports ...

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    2.7 : Ogive Graph01:07

    2.7 : Ogive Graph

    An ogive graph is sometimes called a cumulative frequency polygon. It is one type of frequency polygon that shows cumulative frequency. In other words, ...

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    2.8 : Histogram01:05

    2.8 : Histogram

    The histogram is a graphical representation in the x-y form of data distribution in a data set. The horizontal x-axis is labeled with what the data ...

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    2.9 : Relative Frequency Histogram01:14

    2.9 : Relative Frequency Histogram

    The relative frequency depicts the proportion of data points that have each value. The frequency tells the number of data points that have each value. ...

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    2.10 : Scatter Plot01:15

    2.10 : Scatter Plot

    The most common and easiest way to display the relationship between two variables, x and y, is a scatter plot. A scatter plot shows the direction of a ...

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    2.11 : Time-Series Graph00:54

    2.11 : Time-Series Graph

    A time-series graph is a line graph with repeated measurements taken at successive intervals of time. It is also called a time series chart. To construct ...

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    2.12 : Bar Graph01:07

    2.12 : Bar Graph

    A bar graph is also called a bar chart and consists of bars that are separated from each other. It either uses horizontal or vertical bars to show ...

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    2.13 : Multiple Bar Graph01:07

    2.13 : Multiple Bar Graph

    As the name suggests, a multiple bar graph is the same as a bar graph but has multiple bars to depict relationships between different data values. One can ...

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    2.14 : Pareto Chart00:52

    2.14 : Pareto Chart

    A Pareto chart is a bar graph or a combination of both line and bar graphs. The bar lengths represent the individual values or the frequency, while the ...

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    2.15 : Pie Chart01:04

    2.15 : Pie Chart

    A pie chart (or a pie graph) is a circular graphical chart or a pictorial representation of categorical data. It is divided into slices of pie each ...

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