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So we have arithmetic mean (AM), geometric mean (GM) and harmonic mean (HM). Their mathematical formulation is also well known along with their associated stereotypical examples (e.g., Harmonic mea...
When studying two independent samples means, we are told we are looking at the "difference of two means". This means we take the mean from population 1 ($\bar y_1$) and subtract from it the mean from
What does the notation like 8.6e-28 mean? What is the 'e' for? (2 answers) Closed 8 years ago. After running the lm regression model using R, sometime one is bound to get very small P values or values in the covariance matrix. Something of the sort: -1.861246e-04 for example in a covariance matrix.
The mean minimizes the sum of squared deviations, while the median (sometimes not unique) minimizes the sum of absolute deviations: Somewhat agreed, but I don't fully understand why achieving a minimum is relevant here.
I also guess that some people prefer using mean squared deviation as a name for variance because it is more descriptive -- you instantly know from the name what someone is talking about, while for understanding what variance is you need to know at least elementary statistics. Check the following threads to learn more:
mean - Difference between standard error and standard deviation - Cross ...
The mean of 0 and standard deviation of 1 usually applies to the standard normal distribution, often called the bell curve. The most likely value is the mean and it falls off as you get farther away.
probability - Why are mean 0 and standard deviation 1 distributions ...