Applied Statistics - 3.4 - Histograms Flashcards

1
Q

What is a Histogram?

A

Chart where area of the bar is proportional to the frequency in each class

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2
Q

Area of bar, Frequency Density

Histogram Equations

A
  • Area of bar = k * frequency
  • Frequency density = frequency / class width
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3
Q

How to form a frequency polygon from a Histogram?

A

Join the middle of the top of each bar in the histogram to form a frequency polygon

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4
Q
A
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5
Q

What does Positively/Negatively skews mean?

A
  • High peak at lower values of x
  • High peak at high values of x
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6
Q

How to compare data?

A

Comment on:
- Interquartile range
(less/more precise?)
- Median
(On average has a higher/lower____)
-Outliers
-Positively/Negatively skewed

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7
Q

Strong vs Weak correlation

A
  • Strong correlation means values are close to line of best fit
  • Weak correlation means values are not all close to line of best fit
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