Sampling & Experiments
P-value = 0.001
What is "Assuming the null is true, there is only a 1 in 1000 chance of seeing a test statistic as extreme as or more extreme than the one we observed (in the direction(s) of the alternative)
How to identify outliers for univariate data
What is X < Q1 - 1.5(IQR) or x > Q3 + 1.5(IQR)?
This is The General Multiplication Rule
P(A and B) = P(A)*P(B|A)
The critical value for an 80% confidence interval for a population mean using a sample size of 30
What is invT(0.9 , 29) or invT(0.1 , 29)?
A form of blocking in which each block has exactly two experimental units.
What is matched pairs?
Power of a hypothesis test is 0.3 when the population mean is 35 and the alternative says the population mean is greater than 28.
What is "Assuming the mean is 35, there is a 30% chance that the test will correctly reject the null hypothesis"?
This is the primary condition that must be satisfied in order to infer cause and effect in an experiment.
What is random assignment?
This is The General Addition Rule
What is P(A or B) = P(A) + P(B) - P(A and B)?
The probability of at least 8 successes in 12 trials given a probability of success of 45%.
1-binomcdf(12,.45,7)?
A form of bias that occurs when the wording or format of questioning systematically leads to inaccurate survey results.
What is response bias?
The Probability definition of Events A and B being Independent
What is P(B|A) = P(B) or P(A|B) = P(A)?
This is the formula for Probability of A given B
P(A|B) = P(A and B) / P(B)
The z value for the 80th percentile on a normal distribution.
invNorm(.8,0,1 LEFT)?
The population is divided into groups. A certain number of these groups are randomly selected, and all individuals in the chosen groups are sampled.
What is cluster sampling?
95% Confidence level for a proportion
What "This interval was created using methods that capture the true population proportion 95% of the time"?
This is the primary condition that must be satisfied in order for the results of a study to be generalized to a population.
What is a random sample from the population of interest?
The formula for finding the probability of obtaining the first success on the 5th trial when P(success) = p.
What is P(X=5) = p(1-p)^4
The probability of obtaining the first success on the 12th trial when the probability of success is 0.2
What is geometpdf(0.2 , 12)?
The population is divided into groups. From each of these groups, a sample is selected.
What is stratified sampling?
95% confidence interval (-4.25, -1.33) for the difference of two means (mean #1 - mean #2).
We are 95% confident that the interval (-4.25 , -1.33) captures the true difference in population means (population 1 - population 2)
standard deviation of the sampling distribution of sample means
What is the population standard deviation divided by the square root of the sample size?
The formula for finding 10 successes in 15 trials with P(success)=p.
What is P(X=10) = (15 C 10)*p^10*(1-p)^5
Generate 5 random integers from 1 to 100.
What is RandInt(1, 100, 5)