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     1  ~ 2013 dec 16linear 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.
     2  -1 2014 jan 28leaderboard ad costAdvertising at StatTrek.comAll about advertising at StatTrek.com: Rates , demographics, types of ads , etc. ... Low cost . Banner ads , skyscraper ads , and text ads cost only pennies per day.
     3  +19 2014 mar 07goodness of fitChi-Square Goodness of Fit Test - Stat TrekThis lesson describes when and how to conduct a chi-square goodness of fit test. Key points are illustrated by a sample problem with solution.
     3  +5 2014 feb 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  ~ 2014 feb 03telephone de biaisSurvey Sampling Bias - Stat TrekUndercoverage, voluntary response bias , sampling error, nonresponse bias , response ... The survey relied on a convenience sample, drawn from telephone   ...
     3  ~ 2014 jan 08random number tableRandom Number Generator | Random Number Table - Stat TrekUse the Random Number Generator to create a list of random numbers, based on your specifications. Create a random number table of up to  ... ‎What are random numbers? - ‎What is a random number generator?
     3  +1 2013 dec 18random number generator rangeRandom Number Generator - Stat TrekUse the Random Number Generator to create a list of random ... Numbers were randomly selected from within the range of 0 to 99999. ‎What are random numbers? - ‎What is a random number generator?
     4  +12 2014 mar 07negative 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  ...
     4  +1 2014 feb 28poisson distributionPoisson Distribution - Stat TrekA Poisson distribution is the probability distribution of the outcomes from a Poisson experiment. This lesson describes Poisson experiments and shows how they  ...
     4  +6 2014 feb 20rank of a matrixMatrix Rank - Stat TrekThis lesson defines matrix rank. It shows how the rank of a matrix is related to the linear dependence among its vectors, and it shows how the rank of a matrix is  ...
     5  +6 2014 feb 10statistic 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   ...
     5  -1 2014 jan 10t value calculatorT Distribution Calculator - Stat TrekThe t distribution calculator makes it easy to compute cumulative probabilities, based on t ... Click the Calculate button to compute a value for the blank text box.
     5  -1 2014 jan 10sample 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  ...
     5  ~ 2014 jan 08chi square distributionChi - Square Distribution - Stat TrekThe distribution of the chi-square statistic is called the chi - square distribution . This lesson shows how to compute the chi-square statistic and how to find the  ...
     5  +5 2013 dec 30number sequence generatorUse the Random Number Generator to create a list of random numbers , ... numbers or repeats a particular sequence of random numbers . If the  ...
     5  -1 2013 dec 17help with probability problemsProbability Calculator - Stat TrekThe probability of winning the 100-yard dash is 0.25, and the probability of ... is defined, we enter the problem definition into the Probability Calculator. ... 34 Stories to Help You Actually Understand Statistics
     6  +2 2014 mar 03level 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  ...
     6  ~ 2014 jan 22unique number generatorUse the Random Number Generator to create a list of random numbers, ... Each family has been assigned a unique number from 1 to 20,000.
     6  +3 2014 jan 09sequence number generatorUse the Random Number Generator to create a list of random numbers, ... numbers or repeats a particular sequence of random numbers. If the  ...
     6  -3 2014 jan 01scales of measurementMeasurement Scales - Stat TrekMeasurement scales are used to categorize and/or quantify variables. This lesson describes four scales of measurement used in statistical analysis: nominal ,  ...
     6  -2 2013 dec 20college statistics helpStatistics , Probability, and Survey SamplingThis web site provides training and tools to help you solve statistics problems ... AP and Advanced Placement Program are registered trademarks of the College   ...
     7  ~ 2014 feb 23what 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  ...
     7  -1 2014 feb 07types 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. Includes  ...
     7  +94 2014 jan 26how 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  ...
     7  +7 2014 jan 10free statistics helpThis web site provides training and tools to help you solve statistics problems ... Free statistics tutorials cover statistics , probability, and survey sampling - all  ...
     7  +1 2013 dec 03what is an experimentExperiments in Statistics - Stat TrekDescribes experiments . Covers independent variables (treatments, levels, placebo) and dependent variables. Lists characteristics of a well-designed  ...
     8  +1 2014 feb 21random number generatorUse the Random Number Generator to create a list of random numbers, based on your specifications. Create a random number table of up to  ...
     8  -1 2014 jan 09random number chooser
     8  ~ 2013 dec 09random order generatorUse the Random Number Generator to create a list of random numbers, ... sets of digits (i.e., 0, 1, 2, 3, 4, 5, 6, 7, 8, 9) arranged in random order .
     8  +2 2013 dec 08random sample sizeSample Size : Simple Random Samples - Stat TrekHow to find the smallest sample size that provides the required precision, given simple random sampling. Includes sample problem to illustrate key points.
     9  +4 2014 feb 16random generator
     9  +2 2014 feb 10random number picker
     9  ~ 2013 dec 25random number generater
     9  ~ 2013 dec 24random number genrator
     9  -1 2013 dec 15randomly generated numbersUse the Random Number Generator to create a list of random numbers , based on your specifications. The numbers you generate appear in the  ...
     10  +69 2014 feb 21random surveysSurvey Sampling Methods - Stat TrekDescribes survey sampling methods. Probability and non-probability samples. Simple random samples, stratified samples, cluster samples, systematic samples,   ...
     10  ~ 2014 feb 10random numbers generator
     10  +10 2014 jan 22help with statisticsThis web site provides training and tools to help you solve statistics problems quickly, easily, and accurately - without having to ask anyone for help .
     10  +1 2014 jan 05stratified random samplingStratified Sampling - Stat TrekThis lesson describes the use of stratified random sampling as a sampling method. It covers both proportionate and disproportionate sample designs. Includes  ...
     10  ~ 2013 dec 12statistics help probabilityStatistics , Probability , and Survey SamplingThis web site provides training and tools to help you solve statistics problems ... Free statistics tutorials cover statistics , probability , and survey sampling - all  ...
     10  +38 2013 dec 02success calculator softwareBinomial Calculator - Stat Trek? In a binomial experiment, the probability of success on any individual trial is constant.
     11  +5 2014 mar 02confidence interval formulaConfidence Interval - Stat TrekSpecify the confidence interval . The uncertainty is denoted by the confidence level. And the range of the confidence interval is defined by the following equation .
     11  +14 2014 feb 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. Also  ...
     11  +12 2014 feb 06score grapher view dCumulative Frequency Plots - Stat TrekView video lesson on cumulative frequency plots ... From the graph , you can see that about 25% of students received a score of 64 or less. ... ( D ) 50 inches
     11  +2 2014 jan 09random number selector
     11  ~ 2014 jan 05standard 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  ...
     11  -8 2013 dec 12stat test questionsAP Statistics Practice Test - Stat TrekLike the actual exam , this practice exam has 40 multiple-choice questions , covering a variety of topics. Includes detailed solutions for all test questions .
     11  +5 2013 dec 03create random number
     12  +5 2014 mar 02least-squares regression lineLinear Regression - Stat TrekIntroduction to least-squares linear regression. ... Linear regression finds the straight line, called the least squares regression line or LSRL, that best represents  ...
     12  +7 2014 feb 26linear regression slopeHow to conduct a hypothesis test to determine whether there is a significant linear relationship between an independent variable and a dependent variable.
     12  +6 2014 feb 09average t score excelObtain cumulative probabilities and t scores from an on-line t distribution, statistical table: ... Which random variable should I use - the t score or the sample mean "? .... Statistics for People Who (Think They) Hate Statistics: Excel 2007 Edition
     12  +4 2014 feb 09sample size
     12  -1 2014 feb 05hypothesis 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.
     12  -1 2014 jan 30tutorial outliers statisticsInfluential Points in Regression - Stat TrekFor example, when the data set is very large, a single outlier may not have a big effect on the regression equation. AP Statistics Tutorial . Exploring Data.
     12  -1 2014 jan 09generate random numbers
     12  -6 2014 jan 09refer a friend statsIn general, capital letters refer to population attributes (i.e., parameters); and lower-case letters refer to sample attributes (i.e., statistics ). For example,. P refers to  ...
     12  +5 2014 jan 05what 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.
     12  -1 2014 jan 04chi 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  ...
     12  +25 2014 jan 02study for stat testAP Statistics Study Guides - Stat TrekReview of Study Guides: AP Statistics. Many books provide test -preparation help for the AP Statistics exam . To identify the best study guide, Stat Trek evaluated  ...
     12  -5 2013 dec 29statistical question answeringStatistics Problems With Solutions - Stat TrekProbability and statistics problems. Completely solved in ... Based on AP statistics exam questions . ... The correct answer is B. The solution involves four steps.
     12  -4 2013 dec 20chi square test exampleChi - Square Test of Independence - Stat TrekWe could use a chi - square test for independence to determine whether gender is related to voting preference. The sample problem at the end of the lesson  ...
     13  +18 2014 feb 17confidence intervalConfidence Interval : Definition - Stat TrekDefinition of confidence interval , from the Stat Trek dictionary of statistical terms and concepts. This statistics glossary includes definitions of all technical terms  ...
     13  +15 2014 feb 11confidence interval calculatorA confidence interval describes the amount of uncertainty associated with a sample estimate of a ... Often, the margin of error is not given; you must calculate it.
     13  -4 2014 jan 06bayes theorem examplesBayes Theorem (aka, Bayes Rule) - 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  ...
     13  -1 2013 dec 21null hypothesis exampleFor example , suppose we wanted to determine whether a coin was fair and balanced. A null hypothesis might be that half the flips would result in Heads and half  ...
     14  +87 2014 feb 26sampling techniquesDescribes survey sampling methods . Probability and non-probability samples. Simple random samples, stratified samples, cluster samples, systematic samples,   ...
     14  ~ 2014 feb 23control for confoundingConfounding : Definition - Stat TrekConfounding occurs when the experimental controls do not allow the experimenter to reasonably eliminate plausible alternative explanations for an observed  ...
     14  +44 2014 feb 20standard deviation
     14  +11 2014 feb 10statistics calculator tiAP Statistics Calculator Comparison - Stat TrekReview of graphing calculators approved for use on the AP statistics exam and on the AP ... Texas Instruments , TI -84 PLUS SILV, $114.89, $65.99, 4.5, 141.
     14  +1 2014 feb 08mean 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 .
     14  -3 2013 dec 18margin 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  ...
     15  +26 2014 feb 27f valueF Distribution - Stat TrekThe f statistic , also known as an f value , is a random variable that has an F distribution. (We discuss the F distribution in the next section.) Here are the steps   ...
     15  +8 2014 feb 27box plotBoxplot (aka, Box and Whisker Plot) - Stat TrekHow to read and interpret boxplots (aka, box and whisker plots ). How to use boxplots to display quantitative data. Includes free, video lesson on box and whisker  ...
     15  +7 2014 feb 19easy fit tutorialHow to conduct a chi-square goodness of fit test. The test ... From Stat Trek's free, online statistics tutorial . ... The sampling method is simple random sampling.
     15  +47 2014 feb 17central limit theoremSampling Distribution - Stat TrekThe central limit theorem states that the sampling distribution of any statistic will be normal or nearly normal, if the sample size is large enough. How large is  ...
     16  +85 2014 feb 28variance calculator formulateStatistics Formulas - Stat TrekTrek tutorials. Each formula links to a web page that explains how to use the formula . .... Variance of a linear transformation = Var(Y) = a * Var(X). Standardized  ...
     16  +1 2013 dec 21what is hypothesisHow to use sample data to test statistical hypotheses . Covers the null hypothesis , alternative hypothesis , decision rules, Type I error, Type II error, power,  ...
     16  -11 2013 dec 10statistics and tendenciesMean, Median, and Central Tendency - Stat TrekThe two most common measures of central tendency are the median and the mean. ... Teach yourself statistics . Skip to ... View video lesson on central tendency .
     16  +19 2013 dec 03select random number
     17  +84 2014 feb 28var xMean of a linear transformation = E(Y) = Y = aX + b. Variance of a linear transformation = Var(Y) = a * Var ( X ). Standardized score = z = (x - μx) / σx. t-score = t = (x  ...
     17  ~ 2014 jan 24margin of error calculatorMargin of Error - Stat TrekHow to compute margin of error for proportions and means. ... You can use the Normal Distribution Calculator to find the critical z score, and the t Distribution  ...
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