87k views

### Why does the standard deviation not decrease when I do more measurements? [duplicate]

I made 100 measurements of a certain quantity, calculated mean and standard deviation (with MySQL), and got mean=0.58, SD=0.34. The std seemed too high relative to the mean, so I made 1000 ...
17k views

### Standard Error vs. Standard Deviation of Sample Mean [duplicate]

I'm having difficulty figuring out the difference between (typically referred to as S.E): A. The Standard Error And B. The Standard Deviation of the Sample Mean (typically referred to as s) Are ...
4k views

### Under what circomstances the sample standard error is likely to equal population standard deviation? [duplicate]

Does it make a difference if we assume that sample standard error for a very large sample-size equals population standatd deviation for a target population ?
373 views

### Why do we rely on the standard error? [duplicate]

Possible Duplicate: Difference between standard error and standard deviation I cannot come to terms with the fact that the standard error is used to describe the accuracy of a point estimate. For ...
127 views

### What is the standard error of the mean? [duplicate]

I don't know anything about this topic. Can you explain and describe standard error of the mean?
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### Plain words (non-mathematical) explanation of the difference between Confidence Intervals, Standard Error of the Mean, and Standard Deviation? [duplicate]

As the question states, I'm interested in the difference between CIs, SEM, and SD, explained in plain words (so as to be able to communicate it to people without maths/stats background). My current ...
52 views

### About Standard Error of the Mean [duplicate]

Standard Error of the Mean I do not clearly understand about 'Standard Error of the Mean'? I tried understanding about it but I failed. How do you calculate in order to retrieve 'Standard Error of ...
31 views

### Puzzling contradiction in introductory textbook regarding standard deviation and sample size [duplicate]

I am reading Facts From Figures by MJ Moroney. In one part of the textbook (chapter 10, pages 136-137) he writes of samples taken from a population with a normal distribution, that their "standard ...
188k views

### What is the difference between a consistent estimator and an unbiased estimator?

What is the difference between a consistent estimator and an unbiased estimator? The precise technical definitions of these terms are fairly complicated, and it's difficult to get an intuitive feel ...
81k views

### Converting standard error to standard deviation?

Is it sensible to convert standard error to standard deviation? And if so, is this formula appropriate? $$SE = \frac{SD}{\sqrt{N}}$$
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### ARMA - coefficient interpretation

I would like to interpret my ARMA model. I would like to tell about all those numbers as much as possible. I tried to study it but there as still some issues I am not sure about. I will start by ...
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### When do we use S.E.M. and when do we use S.D.?

Put simply, the standard error of the sample mean is an estimate of how far the sample mean is likely to be from the population mean, whereas the standard deviation of the sample is the degree to ...
7k views

### Confidence intervals without sample size

I'm calculating confidence intervals for data that I generated myself, so the sample size is very large (about 30,000). Using the standard formula where the sample size is taken into account, my "...