chapter 2 unit b E280

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1. frequency distribution (table) for qualitative data
• groups the data into categories and records how many observations fall into each category
• this can be done Nominal or Ordinal scale data
2. A frequency distribution (a table that show frequency of accuracy) for quantitative data
• groups the data into numerical intervals called classes , and records the number of observations that fall into each class
• either Interval or Ratio scale
3. guidelines when constructing frequency distribution (Quantitative data)
Approximating the class width
• Classes are Mutually Exclusive (cannot overlap)
• Classes are Exhaustive (cannot miss a value)
• Largest value-Smallest value
•          Number of classes
4. Cumulative frequency distribution
specifies how many observations fall below the upper limit of a particular class
5. relative frequency distribution
identifies the proportion or fraction of values that fall into each class

• CRF=Class freq
•         total number of observation
6. histogram
is a visual representation of frequency or a relative frequency distribution
7. the shape of most data distributions may be categorized as either
• Symmetric- a mirror image, same on both side
• skewed- (positively skewed right) (negatively skewed left)
8. ogive
plot the cumulative frequ of each class above the upper limit of the corresponding class
9. polygon
plot the class midpoints on x axis and associated frequency in y axis
10. Steam and leaf diagram
• visual display of quantitative (numerical) data it gives an overall picture of the data's center and variability data
• set is separated into two parts; the stem consists of the leftmost
• digit, while the leaf is the last digit that is relevant for data
• distinction
11. scatterplot
• is uesed to determine if two variables are related
• each point is pairing
• Linear- as indicated by an upward or downward sloping trend
• Curvilinear-
• no relationship-

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 Author: Cshowalter ID: 303397 Filename: chapter 2 unit b E280 Updated: 2015-05-30 18:31:10 Tags: e1 Folders: e1 Description: e1 Show Answers:

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