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1  +1 2014 sep 14statistic elementsElement : Definition - Stat TrekDefinition of element , from the Stat Trek dictionary of statistical terms and concepts. This statistics glossary includes definitions of all technical terms used on Stat ...
1  +1 2014 sep 06telephone de biaisSurvey Sampling Bias - Stat TrekDescribes two sources of bias in survey sampling: unrepresentative samples and ... The survey relied on a convenience sample, drawn from telephone  ...
1  ~ 2014 aug 17random number tableRandom Number Generator | Random Number Table - Stat TrekThe numbers you generate appear in the Random Number Table . For help in using the Random Number Generator, read the Frequently-Asked ... ‎What are random numbers? - ‎What is a random number generator?
1  +2 2014 aug 16bayes theorem examplesBayes ' Theorem - Stat TrekBayes ' theorem (also known as Bayes' rule) is a useful tool for calculating ... This section presents an example that demonstrates how Bayes ' theorem can be ...
1  +2 2014 aug 02chi square test exampleChi - Square Test of Independence - Stat TrekThis lesson describes when and how to conduct a chi - square test of independence. Key points are illustrated by a sample problem with solution. ‎Chi-square test for ... - ‎Categorical Variable - ‎Contingency Table - ‎Significance Level
1  ~ 2014 jul 28linear regression t testRegression Slope Test - Stat TrekTest method. Use a linear regression t-test (described in the next section) to determine whether the slope of the regression line differs significantly from zero.
1  +6 2014 jul 25stat test questionsAP Statistics Practice Test - Stat TrekPractice test for multiple-choice section of the Advanced Placement (AP) Statistics exam . Includes 40 questions , each with clear solutions.
2  +1 2014 oct 04goodness of fitChi-Square Goodness of Fit Test - Stat TrekThis lesson explains how to conduct a chi-square goodness of fit test. The test is applied when you have one categorical variable from a single population.
2  ~ 2014 sep 29poisson distributionPoisson Distribution - Stat TrekA Poisson distribution is the probability distribution that results from a Poisson ... The following notation is helpful, when we talk about the Poisson distribution .
2  ~ 2014 sep 28level of confidenceConfidence Level : Definition - Stat TrekDefinition of confidence level , from the Stat Trek dictionary of statistical terms and concepts. This statistics glossary includes definitions of all technical terms used ...
2  ~ 2014 sep 22what is f probability levelF Distribution Calculator - Stat Trek? A probability is a number expressing the chances that a specific event will occur. This number can take on any value ...
2  +1 2014 sep 16standard errorStandard Error - Stat TrekThe standard error is an estimate of the standard deviation of a statistic. This lesson shows how to compute the standard error , based on sample data.
2  +3 2014 sep 08hypothesis testingHypothesis Tests - Stat TrekThis assumption may or may not be true. Hypothesis testing refers to the formal procedures used by statisticians to accept or reject statistical hypotheses.
2  +3 2014 sep 02used graphing calculatorGraphing Calculators - Stat TrekRecommended graphing calculators for AP statistics and calculus. ... (cable included) that can be used to share files with other calculators or to connect to PCs ...
2  +2 2014 aug 27margin of errorMargin of Error - Stat TrekIn a confidence interval, the range of values above and below the sample statistic is called the margin of error . For example, suppose we wanted to know the ...
2  +2 2014 aug 26unique number generatorRandom Number Generator - Stat TrekRandom Number Generator creates random number tables. Up to 1000 ... Each family has been assigned a unique number from 1 to 20,000.
2  ~ 2014 aug 21t statistic calculatorT Distribution Calculator - Stat TrekT distribution calculator finds cumulative probability and t scores. Fast, easy, accurate.
2  ~ 2014 aug 19t value calculatorT distribution calculator finds cumulative probability and t scores. Fast, easy ... text boxes. Click the Calculate button to compute a value for the blank text box. ‎Which random variable should I ... - ‎What are degrees of freedom?
2  +3 2014 aug 17chi square distributionChi - Square Distribution - Stat TrekThe distribution of the chi-square statistic is called the chi - square distribution . In this lesson, we learn to compute the chi-square statistic and find the probability ...
2  +5 2014 aug 12scales of measurementMeasurement Scales - Stat TrekMeasurement scales are used to categorize and/or quantify variables. This lesson describes the four scales of measurement that are commonly used in ...
2  +2 2014 jul 29help with probability problemsProbability Calculator - Stat TrekThe probability of winning the 100-yard dash is 0.25, and
3  +1 2014 oct 03negative binomial distributionNegative Binomial Distribution - Stat TrekIn this lesson, we cover the negative binomial distribution and the geometric distribution. As we will see, the geometric distribution is a special case of the ...
3  ~ 2014 sep 22rank of a matrixMatrix Rank - Stat TrekThis lesson defines matrix rank and shows how to find the rank of a matrix . Includes problems with solutions to illustrate key points.
3  +1 2014 sep 17confidence intervalConfidence Interval - Stat TrekThis lesson explains what a confidence interval is and explains how to construct and interpret confidence intervals . Includes sample problem with solution.
3  +2 2014 sep 09types of matricesMatrix Types - Stat TrekThis lesson defines various kinds of matrices : vector, row vector, column vector, square matrix, symmetric matrix, diagonal matrix, and scalar matrix.
3  +1 2014 sep 07defination one sample t testone - sample t - test : Definition - Stat TrekDefinition of one - sample t - test , from the Stat Trek dictionary of statistical terms and concepts. This statistics glossary includes definitions of all technical terms ...
3  +5 2014 aug 26help with statisticsStatistics and ProbabilityThis web site provides training and tools to help you solve statistics problems quickly, easily, and accurately - without having to ask anyone for help .
3  +8 2014 aug 16check analyze statiticHow to Test Hypotheses - Stat TrekHow to test hypotheses using four steps: state hypothesis, formulate analysis ... This lesson describes a general procedure that can be used to test statistical  ...
3  +17 2014 aug 16sample size formulaSample Size Calculation: Simple Random Sample - Stat TrekThis approach works when the sample size is relatively large (greater than or equal to 30). Use the first or third formulas when the population size is known.
3  +9 2014 aug 08sample size estimationSample Size Calculation : Simple Random Sample - Stat TrekSample size calculation with simple random sampling. How to find smallest sample size that provides desired precision. Sample problem illustrates key points.
3  ~ 2014 jul 31random number generator rangeRandom Number Generator creates random number tables. Up to 1000 numbers per ... duplicates. Each number within a range that you specify.
3  +2 2014 jul 30margin for errorMargin of Error : Definition - Stat TrekDefinition of margin of error , from the Stat Trek dictionary of statistical terms and concepts. This statistics glossary includes definitions of all technical terms used ...
3  +1 2014 jul 24statistics designs of experimentsExperimental Design - Stat TrekIntroduces experimental design – what it is and why it is useful in research. Describes three common ... Experimental design in statistics : Video lesson. The term ...
3  ~ 2014 jul 22random sample sizeThis lesson describes how to find the smallest sample size that provides the desired precision, when the sampling method is simple random sampling.
3  +1 2014 jul 17what is an experimentExperiment - Stat TrekIn an experiment , a researcher manipulates one or more variables, while holding all other variables constant. By noting how the manipulated variables affect a ...
3  +15 2014 jul 17statistic and probabilityWhat is probability ? - Stat TrekWhat is probability ? Describes how to interpret probability . ... The probability of an event refers to the likelihood that the event will occur. ... AP Statistics Tutorial.
3  +2 2014 jul 17create random numberUse the Random Number Generator to create a list of random numbers , based on your specifications. The numbers you generate appear in the ...
4  -2 2014 sep 24linear regression slopeRegression Slope : Confidence Interval - Stat TrekThis lesson describes how to construct a confidence interval around the slope of a regression line. We focus on the equation for simple linear regression , which ...
4  +3 2014 sep 06linear regressionLinear Regression - Stat TrekSimple linear regression . How to define least-squares regression line. How to find coefficient of determination. Includes video lesson on regression analysis.
4  +13 2014 aug 27statistics formula sheetAP Statistics Formulas - Stat TrekHere are all of the formulas used on the Advanced Placement Statistics Exam. Includes links to explanations that describe how to use each formula .
4  +8 2014 aug 22statistics and probabilityIn a statistical experiment, the sum of probabilities for all possible outcomes is equal to one. This means, for example, that if an experiment can have three ...
4  +5 2014 aug 21binary testing calculatorBinomial Calculator - Stat TrekUse the Binomial Calculator to compute individual and cumulative binomial probabilities. For help in using the calculator , read the Frequently-Asked Questions ... ‎What is a binomial experiment? - ‎What is a binomial distribution?
4  +1 2014 aug 19sample mean symbolStatistics Notation - Stat TrekThis web page describes how symbols are used on the Stat Trek web site to represent ... μ refers to a population mean; and x, to a sample mean . σ refers to the ...
4  +3 2014 aug 18how to calculate probabilityThe Probability Calculator computes the probability of one event, based on probabilities of other events. ... Click the Calculate button to create a summary report.
4  +1 2014 aug 16standard deviation definitionStandard Deviation : Definition - Stat TrekDefinition of standard deviation , from the Stat Trek dictionary of statistical terms and concepts. This statistics glossary includes definitions of all technical terms ...
4  +27 2014 aug 16sample size measurement equationSample size calculation with simple random sampling. How to find smallest sample size that provides desired precision. Sample problem illustrates key points.
4  ~ 2014 aug 15stratified random samplingStratified Sampling - Stat TrekDescribes stratified random sampling as sampling method. Covers proportionate and disproportionate sampling. Lists pros and cons versus simple random ...
4  +6 2014 aug 12paired sample t-testHypothesis Test : Paired Means - Stat TrekHow to conduct a hypothesis test for the difference between paired means. The test procedure, a matched-pairs t - test , is illustrated with a detailed example .
4  +6 2014 aug 10chi square testThis lesson explains how to conduct a chi - square test for independence. The test is applied when you have two categorical variables from a single population.
4  +1 2014 jul 24statistics help probabilityFree tutorials cover statistics , probability , and matrix algebra. ... This web site provides training and tools to help you solve statistics problems quickly, easily, and ...
5  ~ 2014 aug 29how use matrixMatrix Algebra Tutorial - Stat TrekDetermine matrix rank (i.e., distinguish singular from non-singular matrices). Find the determinant and inverse for any square matrix. Use matrix algebra to solve ...
5  +1 2014 aug 14chi square calculatorChi Square Calculator - Stat TrekThe chi - square distribution calculator makes it easy to compute cumulative probabilities, based on the chi - square statistic. For help, read the Frequently- Asked ...
5  ~ 2014 aug 01college statistics helpThis web site provides training and tools to help you solve statistics problems ... trademarks of the College Board, which was not involved in the production of, ...
5  -2 2014 jul 27randomly generated numbers
5  +16 2014 jul 19no probability samplingSimple Random Sampling - Stat TrekA sampling method is a procedure for selecting sample elements from a population. A random number is a number determined totally by chance, with no  ...
5  +5 2014 jul 17linear regression equationSimple Linear Regression Example - Stat TrekLinear regression example shows all computations step-by-step. How to find regression equation , make predictions, and interpret results. Includes video lesson.
6  ~ 2014 sep 28least-squares regression lineLeast squares linear regression - Stat TrekSimple linear regression. How to define least - squares regression line . How to find coefficient of determination. Includes video lesson on regression analysis.
6  +5 2014 sep 28f value? An f value (also known as an f statistic ) is a random variable that has an F distribution. Here are the steps required to ...
6  +16 2014 sep 23normal distribution of dataNormal Distribution - Stat TrekThe normal distribution refers to a family of continuous probability ... The normal distribution is defined by the following equation: Normal .... Comparing data sets.
6  +8 2014 sep 23measures of central tendencyThe Mean and Median: Measures of Central Tendency - Stat TrekThis lesson covers the mean and the median. Explains how to compute each measure . Describes pros and cons. Includes sample problems and free video ...
6  ~ 2014 sep 09mean testHypothesis Test for Mean - Stat TrekHow to conduct a hypothesis test for a mean value, using a one-sample t- test . The test procedure is illustrated with examples for one- and two-tailed tests .
6  +7 2014 sep 07combinations and permutationsCombination and Permutation Calculator - Stat TrekCombination and permutation calculator. Finds the number of combinations and permutations that result when you choose r elements from a set of n elements.
6  +3 2014 sep 02tutorial outliers statisticsInfluential Points in Regression - Stat TrekHow to identify influential points ( outliers ) that greatly affect slope of ... AP Statistics Tutorial ... Statistics for People Who (Think They) Hate Statistics , 4th
6  +95 2014 sep 01adding matricesMatrix Addition - Stat TrekMatrix addition and matrix subtraction. This lesson explains how to add matrices and how to subtract matrices. Includes problems with solutions.
6  +1 2014 aug 18standard deviation symbolThis web page describes how symbols are used on the Stat Trek web site to ... x refers to a sample mean. s refers to the standard deviation of a sample. s2 refers  ...
6  +2 2014 aug 18disrecete data exampleDiscrete vs Continuous - Stat TrekDiscrete probability distributions vs continuous probability distributions. Discrete random ... Some examples will clarify the difference between discrete and continuous variables. Suppose the fire ... Counting data points. ▻ Probability laws.
6  +15 2014 aug 14determination of sample size
6  +2 2014 aug 06independent random variablesIndependent Random Variables - Stat TrekWhen a study involves pairs of random variables , it is often useful to know whether or not the random variables are independent . This lesson explains how to ...
6  +4 2014 jul 23statistics and tendenciesthe most "typical" value in a set of values. Statisticians refer to the mean and median as measures of central tendency . ... AP Statistics Tutorial. Exploring Data.
7  +4 2014 oct 01t valueT distribution calculator finds cumulative probability and t scores. Fast ... Enter a value for degrees of freedom. ... A t score is a statistic whose values are given by.
7  +4 2014 sep 25box plotBoxplots - Stat TrekHow to interpret boxplots (aka, box and whisker plots ). How to to display quantitative data with boxplots. Key points illustrated by examples. Plus free video.
7  +4 2014 sep 13sample size
7  +5 2014 sep 11confidence interval calculatorThis lesson explains what a confidence interval is and explains how to construct and interpret ... Often, the margin of error is not given; you must calculate it.
7  +12 2014 sep 06confidence interval calculator meansSuppose that a 90% confidence interval states that the population mean is greater than 100 and ... Often, the margin of error is not given; you must calculate it.
7  +16 2014 aug 19what is standard deviation
7  +5 2014 aug 18what is linearSimple linear regression. How to define least-squares regression line. How to find coefficient of determination. Includes video lesson on regression analysis.
7  +1 2014 aug 16what are variablesVariables in Statistics - Stat TrekCovers use of variables in statistics - categorical vs. quantitative, discrete vs. continuous, univariate vs. bivariate data. Includes free video lesson.
7  +11 2014 aug 14calculating sample size
7  +4 2014 aug 06two sample t testtwo - sample t-test : Definition - Stat TrekDefinition of two - sample t-test , from the Stat Trek dictionary of statistical terms and concepts. This statistics glossary includes definitions of all technical terms ...
7  +6 2014 jul 30population in statisticsPopulation : Definition - Stat TrekDefinition of population , from the Stat Trek dictionary of statistical terms and concepts. This statistics glossary includes definitions of all technical terms used on ...
8  +2 2014 sep 17confidence level calculatorThis lesson explains what a confidence interval is and explains how to construct and ... From the t Distribution Calculator , we find that the critical value is 1.96.
8  +4 2014 aug 31population proportion calculatorProportion : Confidence Interval - Stat Trekwhere P is the population proportion , n is the sample size, and N is the .... From the Normal Distribution Calculator , we find that the critical value is 2.58. Compute  ...
8  +15 2014 aug 24permutations and combinations
8  -4 2014 aug 19free statistics helpFree tutorials cover statistics , probability, and matrix algebra. ... This web site provides training and tools to help you solve statistics problems quickly, easily, and ...
8  +4 2014 aug 11sample size calculation
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