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The raw material of statistics which is comprised of numbers |
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the field of study concerned with 1. the collection, organization, summarization and analysis of data 2. the drawing of inferences about a body of data when only part of the data is observed |
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1. Routinely kept records 2. Surveys 3. Experiments 4. External sources |
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statistical analysis of data derived from the biological sciences and the field of medicine |
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An observed characteristic that differs between individuals/circumstances |
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a variable that can be measured in an amount |
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variables that can be expressed as an attribute and not a number |
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when the value of a variable is determined by chance factors and cannot be predicted, this is known as a random variable |
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Discrete variable characteristics |
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1. can be pigeon holed 2. Has no absolute 0 3. arithmetic cannot be done on it 4. For values A and B there is no C between them |
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Continuous variable characteristics |
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1. Has an absolute 0 2. can have arithmetic operations done on it 3. for values A and B, there is a possible C between them |
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The largest collection of entitites for which we have an interest at a particular time |
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the assignment of numbers to objects or events according to a set of rules |
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the procedure by which we reach a conclusion about a population on the basis of the information contained in a sample that has been drawn from that population |
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(1) uses patterns in data and numbers to (2) answer difficult questions (3) asked by clients (end users/people with money) |
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Plot-interpretation-model |
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Histogram and Stem and Leaf |
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For a symetric graph, use mean and variance For asymetric graph, use 5 number summary for both, mode is also an acceptable statistic |
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The most important question in statistics... |
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2 characteristics of Mediating/lurking variable |
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1. Variable 2. (a) it is a cause that gets inbetween the cause and effect, changing the result (b) and we don't know it is there |
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in terms of how many digits you use... |
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Keep all digits until presentation, then only keep 2 to the right of the decimal |
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the sum from 1 to n of the square of the difference of the value and the mean, divided by the number of values minus 1 |
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What is the equation for the location of the median value? |
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What is the name of the man who organized PIM for the field of statistics? |
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