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Binomial, Normal & t-Distributions

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How to Find Probabilities for a Sample Mean

In statistics, you can easily find probabilities for a sample mean if it has a normal distribution. Even if it doesn’t have a normal distribution, or the distribution is not known, you can find probabilities [more…]

How to Find Binomial Probabilities Using a Statistical Formula

After you identify that a random variable X has a binomial distribution, you'll likely want to find probabilities for X. The good news is that you don't have to find them from scratch; you get to use established [more…]

How to Find the Normal Approximation to the Binomial with a Large Sample n

If you are working from a large statistical sample, then solving problems using the binomial distribution might seem daunting. However, there's actually a very easy way to approximate the binomial distribution [more…]

How to Tell When a Random Variable Doesn't Have a Binomial Distribution

In order to know when a random variable in a statistical sample does not have a binomial distribution, you first have to know what makes it binomial. You can identify a random variable as being binomial [more…]

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