Unit 6
Population parameter
The sum of probabilities is always…
1 (100%)
Pulling name/number/etc out of a hat is an example of…
Selecting random samples (SRS)
What kind of distributions are appropriate for many distributions, whose shape are unimodal and approximately symmetric?
Normal distributions
As sample size increases what happens to standard deviation?
It decreases.
(critical value) * (standard deviation) =
Margin of error
What is the sample space?
All possible outcomes.
What does an experiment have that an observational study doesn’t?
A treatment
Statistics is the study of…
What are the three things you check in the plan stage of solving a problem?
Random, independent, and normal. (Center, spread, and shape)
What is Type I error?
When you reject Ho but you should’ve failed to reject Ho.
The variable that measures the outcome of a study is called…
The response variable
Variables can be…
What is the 10% condition?
n ≤ 0.1N
sample size ≤ 0.1(population size)
How many times should you hit enter when doing proportion z/t intervals and tests on the calculator?
Once
The area under the density curve is…
The probability of an event.
Voluntary response, under coverage, non-response, untruthful answer, ignorance, lack of memory, timing, and phrasing are all examples of…
Bias
What kind of numbers are discrete variables?
Whole numbers
What do we use to check if the sampling distribution will be approximately normal when the population distribution isn’t normal?
The central limit theory (CLT)
What happens to the margin or error as we increase the sample size?
Margin of error decreases.
What is theoretical probability?
What should happen given the sample space.
What is a double blind experiment?
Experiments where the subject and administrator do not know who recieved which treatment
What are percentiles?
The percent of data below a value.
No.