Location here we typically use the sample mean x , balancing
point for a system of weights. Think of seesaw: Suppose
individuals sit on a seesaw. When would it be parallel to the
ground (or balanced)? When the total weights on the left and
right sides are
STAT-451/551 Homework 1 Solutions
(a) Let x = the nonpoint source load of total dissolved solids. Then Proportion(x 15000) =
Proportion(ln(x) ln(15000) = Proportion(ln(x) 9.616). Standardizing, this proportion equals
Definition: A point estimate of is a single value of a statistic .
Example) a) The value of the statistic , computed from a sample of size n, is a point estimate
of the parameter .
is a point estimate of the population proportion for a binomial experim
<Joint distributions: discrete and continuous)
Often we need to determine not only individual behavior but also
the degree of relationship between two variables.
f(x1,x2) = p(X1=x1,X2=X2): joint probability mass function
A page of note and a calculator are allowed but the textbook and lecture notes are not.
1. A sample of 20 glass bottles of a particular type was selected, and the intemal pressure
strength of each bottl