Chapter 15
... Which would be more unusual: a student who is 6’9” tall in the class or a class that has mean height of 6’9”? ...
... Which would be more unusual: a student who is 6’9” tall in the class or a class that has mean height of 6’9”? ...
Theorem If p is a prime number which has remainder 1 when
... Theorem If n is an integer, then n2 + n is even. Greg’s response: I believe it because if n is even, then n2 is even and n is even, and even plus even is even. If n is odd, n2 is odd because odd times odd is odd, and your adding it to an odd, so n2 + n is even. Emily’s response: Because n2 + n = n( ...
... Theorem If n is an integer, then n2 + n is even. Greg’s response: I believe it because if n is even, then n2 is even and n is even, and even plus even is even. If n is odd, n2 is odd because odd times odd is odd, and your adding it to an odd, so n2 + n is even. Emily’s response: Because n2 + n = n( ...
Review Key Concept Section 6-6 Normal as Approximation to
... to Approximate a Binomial Distribution 1. Establish that the normal distribution is a suitable approximation to the binomial distribution by verifying np ≥ 5 and nq ≥ 5. ...
... to Approximate a Binomial Distribution 1. Establish that the normal distribution is a suitable approximation to the binomial distribution by verifying np ≥ 5 and nq ≥ 5. ...
Class4 - NYU Stern School of Business
... distributions • Almost all statistical tests discussed in this text assume normal distributions • These tests work very well even if the distribution is only approximately normally distributed. ...
... distributions • Almost all statistical tests discussed in this text assume normal distributions • These tests work very well even if the distribution is only approximately normally distributed. ...
Central limit theorem
In probability theory, the central limit theorem (CLT) states that, given certain conditions, the arithmetic mean of a sufficiently large number of iterates of independent random variables, each with a well-defined expected value and well-defined variance, will be approximately normally distributed, regardless of the underlying distribution. That is, suppose that a sample is obtained containing a large number of observations, each observation being randomly generated in a way that does not depend on the values of the other observations, and that the arithmetic average of the observed values is computed. If this procedure is performed many times, the central limit theorem says that the computed values of the average will be distributed according to the normal distribution (commonly known as a ""bell curve"").The central limit theorem has a number of variants. In its common form, the random variables must be identically distributed. In variants, convergence of the mean to the normal distribution also occurs for non-identical distributions or for non-independent observations, given that they comply with certain conditions.In more general probability theory, a central limit theorem is any of a set of weak-convergence theorems. They all express the fact that a sum of many independent and identically distributed (i.i.d.) random variables, or alternatively, random variables with specific types of dependence, will tend to be distributed according to one of a small set of attractor distributions. When the variance of the i.i.d. variables is finite, the attractor distribution is the normal distribution. In contrast, the sum of a number of i.i.d. random variables with power law tail distributions decreasing as |x|−α−1 where 0 < α < 2 (and therefore having infinite variance) will tend to an alpha-stable distribution with stability parameter (or index of stability) of α as the number of variables grows.