Fundamentals Of Statistics: Chapter 2

Term Definition
What is a frequency distribution? A table reporting the number of observations falling into each category of the variable. It is the most basic method for organizing data.
What is an example of a frequency distribution? The frequency (f) of people who identify as either Native American (947,500), Native American of Multiple Ancestry (269,700), and Native American of Indian decent (5,537,600).
What is a proportion (p) distribution? A relative frequency obtained by dividing the frequency obtained by dividing the frequency (f) in each category by the total number of cases (n). Also known as P= (f/n)
(It is a whole number)
What is a percentage (p) distribution? A relative frequency obtained by dividing the frequency obtained by dividing the frequency in each category by the total number of cases and multiplying by 100. Also known as (%)=P(100)
(It is a decimal)
What is a relative frequency? Proportions and percentages.
Identify the equation–The number of Native American respondents who identify themselves as simply "Native American" is: (947,500/6,754,800)=.14 Proportion.
Why would it be good to show both the percentage and the frequency on a percentage distribution table? It allows the reader to have a greater understanding of the information gathered.
How do the CATEGORIES or VALUES for an Ordinal variable frequency distribution table need to be organized? They either need to be from high-to-low or from low-to-high. They must be ranked ordered.
How should the Interval-Ration variable frequency distribution table be organized? Due to the wide range of values, the categories should be grouped together. The number of groups to use and how wide the intervals should be is up to the researcher.
Which type of variables are appropriate for Cumulative Distribution? Ordinal or Interval-Ratio.
What is a Cumulative Frequency Distribution? It is a distribution showing the frequency at or below each category (class interval or score) of the variable.
What is a Cumulative Percentage Distribution? It is a distribution showing the percentage at or below each category (class interval or score) of the variable.
What is a rate? A number obtained by dividing the number of actual occurrences (AO) in a given time period by the number of possible occurrences (PO). R=(AO/PO)
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