Chapter 4: Intro to Inferential Stats Flashcards
What does inferential statistics estimate and what is it based on?
It estimates parameter based on statistic.
A measure observed from a population.
Parameter
A measure observed from a sample.
Statistic
Area of inferential statistics concerned with finding a value or range of values for an unknown parameter.
Estimation
Area of inferential statistics that verifies a claim about a parameter or distribution of the population.
Test of Hypothesis
A rule or formula for computing the statistics using the sample data.
Estimator
Can there be several estimators for a particular parameter?
Yes
A type of estimator that gives a single value in estimating a parameter.
Point Estimator
A type of estimator that gives a range of values for estimating a parameter.
Interval Estimator
Measures the closeness of an estimate to the true value.
Accuracy
Measures the closeness of the different possible values.
Precise
What percent of confidence interval will include the true value of parameter if sample size is done multiple times?
1-a%
Formula for the measure of confidence interval’s precision.
UL-LL
What is the effect of a larger sample size on precision?
Increase
What is the effect of a higher confidence level on precision?
Decrease
What is null hypothesis?
No difference between a parameter and a specific value or 2 or more populations.
What is alternative hypothesis?
A difference exists between a parameter and a specific value or 2 or more populations.
Symbols that signify null hypothesis.
=
Symbols that signify alternative hypothesis.
<,>
A hypothesis testing whose course of action is to find evidence to reject Ho.
Fisherian or Traditional Hypothesis Testing
a
level of significance
1-B
power of the test
1-a
level of confidence
What does 1-B mean in terms of Ho?
Reject Ho because Ho is false.
