2116 Univariate Data - DOT Plots

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| By Anthony Nunan
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Anthony Nunan
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2116 Univariate Data - DOT Plots - Quiz

Questions and Answers
  • 1. 

    Dot plots are used for :

    • A.

      All categorical data

    • B.

      All numerical data

    • C.

      Small numerical data sets

    • D.

      Small categorical data sets

    • E.

      Data sets greater than 50

    • F.

      I don't know

    Correct Answer
    C. Small numerical data sets
    Explanation
    Dot plots are a type of graph that displays the distribution of a numerical variable. They are particularly useful for small data sets because they provide a clear visual representation of the data points. Each data point is represented by a dot, allowing for easy comparison and identification of patterns or outliers. Therefore, dot plots are most commonly used for small numerical data sets.

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  • 2. 

    When we describe a dot plot, sometimes we :

    • A.

      Have too little data to comment on the shape of the distribution

    • B.

      Have too much data to comment on the centre of the distribution

    • C.

      Have too much to comment on the distribution at all

    • D.

      Make assumptions about the centre of the distribution

    • E.

      Add more dots to predict the pattern

    • F.

      I don't know

    Correct Answer
    A. Have too little data to comment on the shape of the distribution
    Explanation
    When we describe a dot plot, sometimes we have too little data to comment on the shape of the distribution. This means that there are not enough data points or observations to determine the overall pattern or shape of the data. Without sufficient data, it is difficult to make any meaningful observations or conclusions about the distribution's shape.

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  • 3. 

    By simply looking at a dot plot, it is easy to find the

    • A.

      Modal class

    • B.

      Standard deviation

    • C.

      Interquartile range

    • D.

      Z scores

    • E.

      Mean

    • F.

      I don't know

    Correct Answer
    A. Modal class
    Explanation
    By simply looking at a dot plot, it is easy to find the modal class. The modal class refers to the class or interval in a data set that has the highest frequency or the most occurrences. In a dot plot, the class with the highest number of dots or marks will indicate the modal class.

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  • 4. 

    When creating a dot plot, when several points share the same value, we :

    • A.

      Ignore the duplicate value

    • B.

      Put the value beside the previous dot

    • C.

      Stack the dots on top of one another

    • D.

      Change the colour of the dot

    • E.

      Count the extra dots as outliers

    • F.

      I don't know

    Correct Answer
    C. Stack the dots on top of one another
    Explanation
    When creating a dot plot, if several points share the same value, we stack the dots on top of one another. This means that for each repeated value, a dot is placed on top of the previous dot, creating a vertical stack. This allows us to visually represent the frequency or count of each value in the data set.

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  • 5. 

    The dot plot shown above could be described as :

    • A.

      Pointy

    • B.

      Normally distributed

    • C.

      Symmetrically skewed

    • D.

      Negatively skewed

    • E.

      Optimal

    • F.

      I don't know

    Correct Answer
    B. Normally distributed
    Explanation
    The dot plot shown above could be described as "normally distributed" because the dots are evenly spread out around the center, forming a bell-shaped curve. This indicates that the data is symmetrically distributed around the mean, with an equal number of values on either side.

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  • 6. 

    The dot plot shown above :

    • A.

      Is negatively skewed

    • B.

      Is normally distributed

    • C.

      Symmetrically skewed

    • D.

      Shows no real shape in its distribution

    • E.

      Optimal

    • F.

      I don't know

    Correct Answer
    D. Shows no real shape in its distribution
    Explanation
    The dot plot shown above does not exhibit any clear pattern or shape in its distribution. It does not appear to be skewed, normally distributed, or symmetrically skewed. Therefore, the answer "shows no real shape in its distribution" is the most appropriate explanation for the given dot plot.

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  • 7. 

    The dot plot shown above :

    • A.

      Is negatively skewed

    • B.

      Is normally distributed

    • C.

      Symmetrically skewed

    • D.

      Positively skewed

    • E.

      Optimal

    • F.

      I don't know

    Correct Answer
    D. Positively skewed
    Explanation
    The dot plot shown above is positively skewed because the majority of the data points are clustered towards the lower end of the distribution, with a few outliers on the higher end. This indicates that the data is not evenly distributed and is skewed towards the right side of the plot.

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  • 8. 

    The dot plot shown above has a modal class of :

    • A.

      10

    • B.

      19

    • C.

      11

    • D.

      16

    • E.

      Less than 12

    • F.

      I don't know

    Correct Answer
    C. 11
    Explanation
    The modal class refers to the class with the highest frequency in a data set. In the given dot plot, the class with the highest frequency is 11. Therefore, 11 is the modal class.

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  • 9. 

    The dot plot shown above :

    • A.

      Is negatively skewed

    • B.

      Has a mode of 5

    • C.

      Is symmetrically skewed

    • D.

      Shows no real shape in its distribution

    • E.

      Is optimal

    • F.

      I don't know

    Correct Answer
    D. Shows no real shape in its distribution
    Explanation
    The dot plot shown above does not exhibit any clear shape in its distribution. This means that there is no noticeable pattern or trend in the data points, making it difficult to determine if the distribution is skewed, symmetric, or has a mode. Therefore, the answer "shows no real shape in its distribution" is the most appropriate.

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  • 10. 

    The dot plot shown above has a range of :

    • A.

      10

    • B.

      19

    • C.

      11

    • D.

      16

    • E.

      9

    • F.

      I don't know

    Correct Answer
    E. 9
    Explanation
    The correct answer is 9. This is because the range of a dot plot is the difference between the highest and lowest values. Looking at the given values, the highest value is 19 and the lowest value is 10. Therefore, the range is 19 - 10 = 9.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 23, 2013
    Quiz Created by
    Anthony Nunan
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