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Flashcards · Maths · Statistics

Pie Charts, Bar Charts and Stem-and-Leaf Diagrams

16 cards

  1. How do you calculate the angle for a sector of a pie chart?

    Frequency divided by total, multiplied by \(360^\circ\).

  2. How many degrees represent each person in a pie chart of 60 people?

    \(6^\circ\).

  3. How do you find a frequency from an angle?

    Angle divided by 360, multiplied by the total.

  4. What do the angles in a pie chart add up to?

    \(360^\circ\).

  5. What is a dual bar chart?

    A bar chart with two sets of bars side by side for comparing two groups.

  6. What is a stem-and-leaf diagram?

    A diagram that sorts data into stems and leaves while keeping every value.

  7. What must a stem-and-leaf diagram include?

    A key.

  8. How do you find the median from a stem-and-leaf diagram?

    Count to the middle value, or take the mean of the two middle values.

  9. What does the key \(2 \mid 3\) mean when the key says 23?

    The value is 23.

  10. Why should leaves be in order?

    It makes the median, quartiles and range easy to find.

  11. How can a bar chart be misleading?

    The vertical scale may not start at zero, or the bars may have uneven widths.

  12. Why is a 3D pie chart misleading?

    The 3D effect distorts the sizes of the sectors.

  13. What is the range of a data set with the highest value 45 and the lowest 12?

    33.

  14. How do you compare groups of different sizes?

    Use fractions or percentages rather than raw frequencies.

  15. What fraction of a pie chart is a \(90^\circ\) sector?

    \(\dfrac{1}{4}\).

  16. What percentage of a pie chart is a \(54^\circ\) sector?

    15%.