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23 Cards in this Set
- Front
- Back
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What is the mean of a group of numbers ?
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The mean is the sum of a group of numbers divided by the number of the group of numbers.
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What is the median of a group of numbers ?
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The median of a group of numbers is the number where half of the numbers are less than it and half are greater than it.
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What is an outlier ?
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It is an observation that falls well above or below the bulk of the data.
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What is the mode of a number set ?
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The mode is the value that occurs most frequently in a data set or a probability distribution.
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What is range in statistics ?
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The range is the length of the smallest interval which contains all the data. It is calculated by subtracting the smallest observation (sample minimum) from the greatest (sample maximum).
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What are variables ?
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The characteristics observed to address the questions posed in a study are called variables.
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A variable is called categorical ____________.
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if each observation belongs to one set of catergories.
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A variable is called quantitative ____________.
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if observations on it take numerical values that represent different magnitudes of the variable.
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What are the two diferent catergories of quantitative variables ?
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Discrete and continous.
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A quantitative variable is discrete_______?
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if the possible values form a set of seperate numbers ie a finite number range.
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A quantitative variable is continuous_______?
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if the possible values form an interval. ie they have an infinite possible set of values.
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What are the two diferent catergories of quantitative variables ?
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Discrete and continous.
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A quantitative variable is discrete_______?
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if the possible values form a set of seperate numbers ie a finite number range.
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A quantitative variable is continuous_______?
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if the possible values form an interval. ie they have an infinite possible set of values.
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What is an experiment?
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an activity whose results can be observed and recorded?
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What is an outcome?
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each of the possible results of an experiment?
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what is a sample space?
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A set of all possible outcomes for an experiment.
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What must be present for a line graph to be valid?
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1.both axes must have label.
2.graph must have a title. 3.graph must start at zero. 4.scales must be evenly spaced |
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Why should you not use volumes to graph one dimensional measurments?
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volume distort images of measuremnts due to the fact that a change in volume signifys a large change in the dimensions of an object.
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Why does a circle graph better compares different groups?
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Because it uses precentages and the size of the sections are representative of those precentages.
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A geometric sequence is obtained_______.
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by multipling by a fixed number
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What is the formula for determine a number in a geometric sequence?
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An=A1*R^N-1
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What is the formula for determine a number in an arithmetic sequence?
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A
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