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| the science of collecting, organizing, summarizing, and analyzing information to draw conclusions of answer question. |
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| organizing and summarizing the information collected. |
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| takes results obtained for a sample, extends them to the population, and measures the reliability of the result. |
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| allow for classification of individuals based on some attribute or characteristic |
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| provide numerical measures of individuals. addition and subtraction can be performed on these values and it will provide meaningful results. |
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| quantitative variable that has either a finite number of possible values or a countable number of possible values. |
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| and quantitative variable that has a infinite number of possible values that are not countable. |
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| may be related but are not identified in the study |
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| if every possible sample has an equally likely chance of occurring. |
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| seperating the population into nonoverlapping groups called strata and then obtaining a simple random sample from each stratum. the individuals in each stratum should be similar in some way. |
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| obtained by selecting every kth individual from the population. the first selected corresponds to a random number between 1 and k. |
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| obtained by selecting all individuals within a randomly selected collection or group of individuals. |
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| a sample in which the individuals are easily obtained. |
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| errors that result from the survey process. |
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| results from using sampling to estimate information regarding a population. this type of eror occurs because a sample give incomplete information about the population. |
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| completely randomized design |
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Definition
| one in which each experiemntal unit is randomly assigned to a treatment. |
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| experimental units are paired up |
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| grouping similar experiemntal units together and then randomizing the experimental units within each group to a treatment |
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| lists each category of data and the number of occurences for each category of data. |
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| the proportion of observations within a category |
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| graphs frequency or relative frequency |
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| bar graph whose bars are drawn in decreasing order of frequency or relative frequency |
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| constructed by drawing rectangles for each class of data. the height of each rectangle is the frequency or relative frequency of the class. the width of each rectangle is the same and the rectangles touch each other. |
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| found by ading consecutive lower class limits and dividing the result by 2 |
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| drawn by plotting a point above each class midpoint in a horizontal axis at the height equal to the frequency of the class, then draw a straight line to each point. |
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| graph that represents the cumulative frequency or cumulative relative frequency for the class. |
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| descriptive measure of a population |
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| descriptive measure of a sample |
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| the value that lies in the middle of the data when arranged in ascending order. |
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| the most frequent observation of the variable that occurs in the data set |
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| difference between the largest data value and the smallest data value |
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