A three-way ANOVA is used to determine how three different factors affect some response variable. Three-way ANOVAs are less common than a…
Statisticals Tutorials
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- Hypothesis TestingStatisticals Tutorials
Two Sample Z-Test: Definition, Formula, and Example
by Tutor AspireA two sample z-test is used to test whether two population means are equal. This test assumes that the standard deviation of each…
- Hypothesis TestingStatisticals Tutorials
One Sample Z-Test: Definition, Formula, and Example
by Tutor AspireA one sample z-test is used to test whether the mean of a population is less than, greater than, or equal to some…
- Confidence IntervalsStatisticals Tutorials
How to Find a Confidence Interval for a Median (Step-by-Step)
by Tutor AspireWe can use the following formula to calculate the upper and lower bounds of a confidence interval for a population median: j:…
- Random VariablesStatisticals Tutorials
An Introduction to the Exponential Distribution
by Tutor AspireThe exponential distribution is a probability distribution that is used to model the time we must wait until a certain event occurs.…
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The uniform distribution is a probability distribution in which every value between an interval from a to b is equally likely to…
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One of the key assumptions of linear regression is that the residuals are distributed with equal variance at each level of the…
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Often in statistics we’re interested in collecting data so that we can answer some research question. For example, we might want to…
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When we want to understand the relationship between a single predictor variable and a response variable, we often use simple linear regression.…
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A Kruskal-Wallis test is used to determine whether or not there is a statistically significant difference between the medians of three or more…