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coy sumlar

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SURVEY OF STATISTICS A survey is an investigation about the characteristics of a given population by means of collecting data from a sample of that population and estimating their characteristics through the systematic use of statistical methodology.

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SURVEY OF STATISTICS Example: survey of major league baseball players hitting stats who do vs. don’t use steriods.

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UNIVARITIVE DATA Data for one variable Example: Travel Time (in minutes): 15, 29, 8, 42, 35, 21, 18, 42, 26 The data is for the variable Travel Time (If you have two sets of data, such as ice cream sales vs temperature, it is called "Bivariate Data")

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SURVEY QUESTION Web term: a sentence of inquiry that asks for a reply. Survey questions can be of different types and serve to gather different sets of data. COYS TERM: So basically A QUESTION THAT SIMPLY as for a answer, so its non rhetorical. This question can be put in to many different forms or statements.

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SPREAD A measure of spread tells us how much a data sample is spread out or scattered. We can use the range and the interquartile range to measure the spread of a sample. Measures of spread together with measures of location (or central tendency) are important for identifying key features of a sample to better understand the population from which the sample comes from.data samplerange measures of location (or central tendency) population

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NATURAL VARIABILITY Variability definition, apt or liable to vary or change; changeable: variable weather; math's. a. an expression that can be assigned any of a set of values... weather events occur in the context of natural variability and the changing climate.

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HISTOGRAM histogram is a graphical representation of the distribution of data. It is an estimate of the probability distribution of a continuous variable and was first introduced by 1] A histogram is a representation of tabulated frequencies, shown as adjacent rectangles, erected over discrete intervals (bins), with an area equal to the frequency of the observations in the interval.probability distributioncontinuous variablefrequenciesrectangles

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TREATMENT : the way that you think of and act toward someone or something : the way that you deal with or discuss a subject : something that deals with or discusses a subject.

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NON-RESPONSE BIAS NON-RSPONSE BIAS occurs in statistical surveys if the answers of respondents differ from the potential answers of those who did not answer.statistical surveys DIRECT DIFFRENCE IN A RESPONSE BIAS!!!!

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HYPOTHESIS A statement that is predicted to be true but you run a test to see if it is in fact true or not.

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SAMPLING A selection taken from a larger group (the "population") so that you can examine it to find out something about the larger group. For example if a baseball stats analysis who studied all three major parts of baseball (hitting,pitching,fielding) just studied Hitting statistics that would be a example of sampling.

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STATISTICAL DATA Bias: Bias is a general statistical term meaning a systematic (not random) deviation from the true value. A bias of a measurement or a sampling procedure may pose a more serious problem for researcher than random errors because it cannot be reduced by mere increase in sample size and averaging the outcomes.

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STATISTICS CHART

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NON EXAMPLES

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UNIVARITIVE DATA NOPE! NOPE!

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!!!!FAIL!!! SURVEY OF STATISTICS

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SPREAD

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● Midterm exam next Monday in class ● Bring your own blue books ● Closed book. One page cheat sheet and calculators allowed. ● Exam emphasizes understanding.

● Midterm exam next Monday in class ● Bring your own blue books ● Closed book. One page cheat sheet and calculators allowed. ● Exam emphasizes understanding.

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