Free samples
You can rank the data you collect with this level of measurement, but don't take differences! They might not make sense.
What is ordinal level of measurement?
This statistic measures the spread of data, but inadvertently squares the units of the original data
What is variance?
When we select items at random with this condition, each selection is dependent on the previous one
What is sampling without replacement?
Percentiles of this kind of distribution are used to find the margin of error for a population mean when the population standard deviation is unknown
What is a t distribution?
Do this if you get a very large chi square statistic in a goodness-of-fit test
What is reject the null hypothesis of goodness-of-fit?
This kind of data visualization tool lets you display data over time - and track upward and downward changes
What is a time-series graph?
The 1.5xIQR standard for outliers relies on this measure of relative standing
What is a quartile?
If you take a bag full of red and blue Legos and pick out 4 of them, carefully putting each one back before you pick another, this distribution describes the number of red Legos you can select
What is a binomial distribution?
The left and right tails of this distribution of the same area are mirror images of each other and used in the margin of error for a population proportion
What is the standard normal distribution?
The likelihood of making a Type I error in a hypothesis test
What is level of significance?
Separating a class by age group, and randomly selecting one person from each age group is an example of this kind of sampling method
What is stratified sampling?
To make the square of this statistic an unbiased estimator, we're forced to divide by n-1 instead of n
What is sample standard deviation?
The probability of the union of this kind of events is the sum of the probabilities of each event
What are disjoint events?
This kind of distribution has 2 degrees of freedom and is used in the test for equality of variances
What is an F distribution?
Use this kind of test if you are testing for equality of means where you have dependent samples
What is a matched pair T test?
Using this kind of sampling can introduce non-random sampling error because you can't force someone to answer your question
What is voluntary response sampling?
The sampling distribution of this statistic has a bell-like curve shape when we don't know the population standard deviation
What is sample mean?
A pair of events are described as this if the conditional probability of one event given the certainty of the other is the same as its regular probability
What are independent events?
For this kind of distribution, all percentiles are positive and is used in the calculation of confidence interval for sample variance
What is a chi square distribution?
This test assumes that the underlying distributions of the two sample proportions can be approximated as normal
What is the 2 proportion Z test?
The bars of this kind of data visualization tool represent the proportion of times that something in that category has occurred
What is a relative frequency distribution?
If your age is this statistic, then half of the people in the room are younger than you
This interpretation of probability supposes that an experiment, if repeated infinitely many times, assigns to the associated events the correct likelihood of occurrence
What is frequentist probability?
For a t distribution, you can get the critical value for the right tail using this rule and the critical value for the left tail
What is the "one-minus" or complementary events rule?
This procedure tests a claim of equality of more than three means for samples organized by only one factor, and is at its core, an F test
What is one-way ANOVA?