Show:
Organizing Data
Data Relationships
Producing Data & Experiments
Probability & Distributions
Inference & Tests
100
This measure of center is more resistant to outliers than the mean.
What is the median?
100
observed y - predicted y
What is the residual?
100
This phrase is used to describe an observed effect so large that it would rarely occur by chance.
What is statistically significant?
100
This type of random variable requires a fixed number of trials.
What is a binomial random variable?
100
The type of significance test used for the mean of a single population when the standard deviation of the population is unknown.
What is a T test (or T procedure)?
200
To calculate, subtract the mean of the distribution from the observed x, then divide by the standard deviation.
What is the z-score (or standardized value)?
200
Measures the direction and strength of a linear relationship between two quantitative variables.
What is correlation (or r)?
200

What did Mr. Purvis major in?

Statistics and Music

200

how do you calculate the mean of random variable X-Y

mean X - mean Y

200

What is the interpretation of a 95% confidence level?

If we did this test many many times, we would expect 95% of our confidence intervals to contain the true parameter

300

Which rule tells you how much data lies between 1, 2, and 3 standard deviations of a normal curve?

What is the 68-95-99.7 rule?

300

What value is interpreted as how much of the variation in y can be explained by x

What is the coefficient of determination (or r squared)?

300

why do we need random assignment in experiments?

generalization to the population

300

What does it mean for 2 variables to be independent

One happening does not affect the probability of the other happening

300

The conditions to use this test include all expected counts be greater than or equal to 5.

What is the chi-square test?

400

How do you calculate outliers for a box plot?

x < Q1- 1.5IQR

x > Q3+ 1.5IQR

400

What in a residual plot will tell us if there is a linear relationship between two variables?

No pattern

400
why do we need random assignment in an experiment

So that we an imply causation between our explainatory and response variables

400
The condition involving the population size that must be satisfied to use sigma divided by the square root of n as the standard deviation of a sampling distribution.
What is 'the population is at least 10 times the sample size'?
400

what are the three conditons to check when doing a test for a single proportion

Random assignment-

10%- n<  (1/10)N

Large counts- np>10    n(1-p)>10

500
This calculator command can be used to find the area under a normal distribution and above an interval.
What is normalcdf?
500

What does DUFS stand for and what does each word mean?

Direction

Unusual Feature

Form

Strength

500

What is a the difference between a cluster sample and a stratified random sample?

in cluster sampling you randomly select entire groups and include all units of each group in your sample. However, in stratified sampling, you select some units of all groups and include them in your sample

500

The standard deviation of random variable x+y is calculated how?

adding the variances of x and y then square rooting it

500

what is the equation for a confidence interval for a population mean?

x-bar (+/-) t*(sd/sqrt(n))