Measure of location
The value of The midpoint The weighted
of the values
mean of a set
observation after they have of numbers
that appears been ordered
X1, X2, ., Xn,
Class 11 - Independent Two-Sample Tests of Hypothesis
1. Equal Variances with Sigma Known
- The samples are from independent populations. The formula for
computing the value of z is:
U s e if s a m p le s iz e s 3 0
a n d 1 a n d 2 a re k n o w n
Class 10: Single Sample Hypothesis Tests Population Means With Sigma
Unknown and Proportions
1. When sigma is unknown, we use t-distribution
The current rate for producing 5 amp fuses at Neary Electric Co. is 250
per hour. A new machine has been
Class 8 - Confidence Intervals for Proportions and Sample Size
- The binomial conditions, discussed in Chapter 6, have been met.
Briefly, these conditions are:
a. The sample data is the result of counts.
b. There are only two possible outc
Single Sample Hypothesis Tests Population Means With Sigma Known
1. Hypothesis testing:
(H0 and H1 are mutually exclusive and collectively exhaustive)
Type I: (significance level)
2. TEST STATISTIC - A value, determined from sample information,
Class 6 - Sampling, Sampling Distributions, and the Central Limit
1. Type of Sampling
selected so that
each item or
person in the
the same chance
Class 7 Confidence interval for mean
- A confidence interval estimate is a range of values constructed from
sample data so that the population para
Class 5 - The Normal Probability Distribution
- A continuous probability distribution provides the probabilities
associated with outcomes of a continuous random variable.
Probabilities for continuous distributions are generally determined
Class 3 Probability
An experiment is a process that leads to the occurrence of one and only one
of several possible observations.
An outcome is the particular result of an experiment.
An event is the collection of one or more outcomes of an
Class 4: Random Variables and Probability Distributions
1. Random variables:
- A quantity resulting from an experiment that, by chance, can
assume different values.
- DISCRETE RANDOM VARIABLE A random variable that can
assume only certain clearly separate
Class 1: Introduction to Statistics
1. Important concepts
methods of organizing,
A decision, estimate, prediction, or
summarizing, and presenting data generalization about a population,
in an informative way.
based on a sample.
Class 12: Two-sample Hypothesis Tests - Proportions and Dependent Samples
1. Two sample tests of proportion:
2. Dependent sample
- Dependent samples are samples that are paired or related in some
- For example:
If you wished to buy a car you wou