# Linked Questions

17 questions linked to/from How does the standard error work?
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Possible Duplicate: How does the standard error work? What is the estimate of sample mean variance and how do you get it? Are my understandings of the following correct? $var(Y)=\frac{1}{N} \sum ... 2answers 47 views ### Variance calculation [duplicate] Can someone explain why: Given a set of n independent observations Z1...Zn, each with variance K. The variance of the mean is K/n? 0answers 45 views ### Very easy question : Sample Variance [duplicate] Possible Duplicate: How does the standard error work? Let's say I have an unbiased estimator, which is the sample mean, to estimate$\theta$. When can you say that $$VAR[\overline{X}] = \frac{\... 0answers 22 views ### How do I add a “confidence rating” to something? [duplicate] I have a bunch of survey responses from people all over the country. Each survey has one question: "How much do you like X?" (X isn't important here), where answers range from 0 (not at all) to 100 (a ... 0answers 19 views ### Standard error, margin of error, polls and binomial distribution [duplicate] So, when doing polling, we use binomial distribution to capture the data (in case there are only two choices.). My question is, let us say that estimated percentage according to the poll that ... 0answers 15 views ### Standard error for expected value [duplicate] I have a computer simulation from which I get a sample of values of some microscopic quantity X, i.e. \{ x_1,\ldots,x_N \}. I'm interested in estimating the expected value of X, i.e. E[ X]\... 5answers 6k views ### Strategies for teaching the sampling distribution The tl;dr version What successful strategies do you employ to teach the sampling distribution (of a sample mean, for example) at an introductory undergraduate level? The background In September I'll ... 3answers 22k views ### How can I calculate margin of error in a NPS (Net Promoter Score) result? I'll let Wikipedia explain how NPS is calculated: The Net Promoter Score is obtained by asking customers a single question on a 0 to 10 rating scale, where 10 is "extremely likely" and 0 is "... 2answers 11k views ### What is the null hypothesis of a MANOVA? Background In order to analyze differences in some continuous variable between different groups (given by a categorical variable), one can perform a one-way ANOVA. If there are several explanatory (... 3answers 10k views ### Why compare sum of squares with ANOVA (and not mean)? I got the following result of a ANOVA analysis of five independent variables with 5,8,2,2,6 levels and 5 replications for each combination: ... 3answers 1k views ### Standard error of a population I measure the weight of 100 people and pick 20 lots of 5 people from these 100. Therefore n = 5, repeated 20 times. The 100 people represent the population and groups of 5 people represent samples ... 1answer 302 views ### What does the standard error of my IV estimate tell me? I have computed the IV estimate and the standard error of the IV estimate. Why do I care about its standard error? 0answers 656 views ### Understanding standard error of the mean Wikipedia article about standard error It's clear to me that the formula$${SD}_\bar{x}\ = \frac{\sigma}{\sqrt{n}}$$is equal to the true standard deviation of the sample mean, given that \sigma ... 1answer 123 views ### Are degrees of freedom n-1 for both the sample standard deviation of the individual observations and for the standard error of the sample mean? I collect n (<20) i.i.d. observations from any distribution. In order to compute the sample variance, I take$$s^2=\sum_i \frac{(\bar{X}-X_i)^2}{n-1}$$If I want to build a confidence ... 1answer 62 views ### Sampling Distribution [closed] Suppose$X \sim N(\mu, \sigma^2)$. After$n$independent draws$\bar{X} \sim N(\mu, \frac{\sigma^{2}}{n})$. I am assuming that each draw contains$n\$ numbers? Because if each draw only had one number ...

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