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AICP Statistics

Stat terms & functions

QuestionAnswer
What is the range? The highest - lowest number in a population.
What is the mode? Value that occurs most often in a population
What is the population All recorded observations in a study
What is the sample A specific defined portion/group of a population
What is a positive correlation between variables When a positive (high) on one variable produces a positive (high) result on another variable
What is a negative correlation When a reduction in one variable leads to a decline in another variable
What is a random sample a set of items that have been drawn from a population in such a way that each time an item was selected, every item in the population had an equal opportunity to appear in the sample.
Why is a random sample important? To provide an approximation of the characteristics of the population
What is a normal distribution? One tht is symmetrical around the mean. A bell curve.
Inferential Statistics The characteristics of a population based on observations on a sample of the population.
What are the three methods of reporting Central Tendandy? Mean, Median, and/or Mode
What is the Median in a sample? The middle number in a distribution. (2, 3, 4, 12, 16) answer = 4
What are some examples of nominal data? Race, SSN, sex. Mutually exclusive groups that lack intrinsic order
What is the only measure of central tendancy that can be used for nominal data? Mode
Name the methods of central tendancy that can be used for ordinal data? Mode & Median
Values that are ordered so that inferences can be made regarding the magnitude is what type of data (i.e. letter grade) Ordinal Data
What type of data has an ordered relationship with magnitude (i.e. temperature) Interval Data
Any form of central tendancy can be used for this form of data that has an ordered relationship & equal intervals. Ratio Data
What is a variance? The average squared difference of scores from the mean score of a distribution
Standard Deviation Square root of the variance
Created by: kathie_we
 

 



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