There's a Test?
Number of cars in a parking lot were tallied Monday, Tuesday, Wednesday, Thursday, and Friday. When testing if the parking lot has the same number of cars each day of the work week, this is the test you need.
What is a Chi Squared Goodness of Fit Test?
This type of distribution requires a fixed number of trials, each observation to be independent, only two outcomes ("success" or "failure"), and same probability for each trial's success.
What is a binomial distribution?
When you're deciding if that p-value is serving stats tea or just being mid, this greek letter's threshold tells you if the results are lowkey significant or just flexing.
What is alpha (alpha level)?
This sampling technique divides the population into subgroups based on a shared characteristic and then randomly selects from each subgroup.
What is stratified random sampling?
Given two independent events, A and B, this formula calculates the probability that both events occur. It would be used for this question: "What is the probability that I pick an Ace then pick a heart if I replace the car and shuffle in between picks?"
What is P(A) * P(B)?
This is the statistical test you'd need if a teacher wants to know if her class mean score on the AP Statistics exam is different than the national mean, which is 2.89.
What is a 1 sample T-Test for a mean?
These are the three percentages from the Empirical Rule, which describe the percentage of data which falls within 1, 2, and 3 standard deviations from the mean in a Normal distribution.
What are 68% - 95% - 99.7%?
The probability of rejecting a false null is major. This greek letter expression symbolizes power, which is the complement of making a type II error. No cap!
What is 1- β?
This term refers to a procedure in an experiment where neither the participants nor the researchers know who is receiving the treatment and who is receiving the placebo.
What is double-blind?
Given two mutually exclusive events, A and B, this formula calculates the probability that either event A OR event B occurs. It would be used to answer this question: "What is the probability of rolling a 6 or a 2 on a regular 6 sided die?"
What is P(A) + P(B)?
This test should be used to see if there is a difference between the graduation rate of Bothell High School compared to the graduation rate of North Creek.
What is a 2 sample Z-test for proportions?
This distribution is used to determine the probability of getting our first success after X number of trials.
What is the Geometric distribution?
This Greek letter’s the OG of measuring spread — it tells you how much the data’s vibing away from the mean.
What is sigma?
An airline wants to survey its customers, so it randomly selects 5 flights (out of 100s of flights) in one day and surveys every passenger on those flights. This is the type of sample that would be collected.
What is a cluster sample?
If P(A)=P(A|B) and P(B)=P(B|A), then A and B are considered this type of events.
What are independent events?
A random selection of 5000 students from UCLA and USC university were asked for their race. This is the statistical test to find if the racial distribution of students the same for UCLA and USC.
What is Chi-Square Test for Homogeneity?
This distribution is commonly used to test whether observed frequencies differ from expected frequencies or to test independence in a contingency table. It is always skewed right.
What is a chi-square distribution?
This chill lil Greek letter is the main character when it comes to averages — the for real mean of the population.
What is mu?
This term describes a variable that is related to both the explanatory and response variables and can distort the results of an experiment.
What is a confounding variable?
Given two events, A and B, this formula calculates the probability that either event A or event B occurs when they are not mutually exclusive. It would be used for this question: "What is the probability that a randomly chosen house has a garage or a security system?"
What is P(A) + P(B) - P(A and B)?
A track coach wants to see if her training is leading to improvement in her sprinters 100m sprint times. She runs a test to see if there is a difference between their times at the beginning of the season and after her training at the end of the season. This is the statistical test you'd need.
What is a Matched Pairs T-Test or 1 sample t-test for a mean difference?
This is a family of distributions and as the degrees of freedom increase, this distribution becomes increasingly similar to the Normal distribution.
What is the t-distribution?
This stat tells you if a data point is chillin’ with the crowd or being the drama. It measures how many standard deviations someone’s out here doing the most.
What is a z-score?
In this type of design, two subjects with similar characteristics are grouped together, and each of the pair is randomly assigned to a different treatment to control for variability.
What is matched pairs?
This term refers to the event that includes all possible outcomes that are not in event A. Everything but A.
What is the complement (of A)?