Homework#9

Homework#9 - Stat 133 Autumn 2007 Homework#9(10 points Due...

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Stat 133 Autumn 2007 NAME Allison Heck Homework #9 (10 points) GROUP # __________ Due Tuesday Nov. 27 (at or before the beginning of recitation) 1. Let X have a normal distribution with mean μ x and standard deviation σ x . Suppose you take a random sample of size n and look at the sample mean X . What is the mean of X ? a. n x σ b. x σ c. n x μ d. x μ 2. Let X have a normal distribution with mean μ x and standard deviation σ x . Suppose you take a random sample of size n (n > 1) and look at the sample mean X . The standard deviation (aka standard error) of X is: 3. Let X have any distribution with mean μ x and standard deviation σ x . Suppose you take a random sample of size n and look at the sample mean X . The distribution of X is:

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