Organizing Data
This measure of center is more resistant to outliers than the mean.
What is the median?
observed y - predicted y
How do we calculate a residual?
This phrase is used to describe an observed effect so large that it would rarely occur by chance.
What is statistically significant?
This type of discrete random variable has outcomes that are binary and requires a fixed number of trials.
What is a binomial random variable?
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?
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)?
Measures the direction and strength of a linear relationship between two quantitative variables.
What is correlation coefficient (or r)?
randInt(1,9,3)
What is the calculator command for generating 3 random numbers from 1 to 9?
The type of variable where the probability distribution assigns probability as the area under the density curve above a specific interval. Individual outcomes have a probability of 0.
What is a continuous random variable?
The calculator command for a 95% confidence interval for proportions.
1-PropZint
This rule helps to determine if data is normally distributed by checking the % of observations within one, two, and three standard deviations of the mean.
What is the 68-95-99.7 (or empirical) rule?
The fraction of the variation in the values of y that is explained by the LSRL of y on x.
What is the coefficient of determination (or r squared)?
This experimental design involves the random assignment of units to treatments which are carried out separately within each group of units known to be similar in some way that is expected to affect the responses.
What is block design?
This is the probability of getting an observation as extreme or more extreme than what you saw in your data, if the null were really true.
What is a p-value
The square of the standard deviation.
What is the variance?
The predicted increase in your y variable, for every one unit increase in your x variable.
What is the slope?
The 4 basic principles of experimental design.
What are compare, control, randomize, and replicate?
The calculator command to find the probability of finding your first head on the 3rd flip of a fair coin
What is Geometpdf(.5, 3)
The three conditions to be verified for inference about a proportion. (Be specific for the 3rd one!)
What are Random sampling or assignment, the population size be greater than or equal to 10n and n times p & n times (1 - p) be greater than or equal to 10?
A graphical display that provides cumulative information in terms of percentiles.
What is an Ogive
If we observe a curved pattern in this plot, we know the linear model is not appropriate
What is a residual plot?
The steps for picking a random sample of 10 out of a population of 100 using a random number table.
What are list the individuals, assign digits 00 to 99, read the table ignoring repeats and numbers outside your range, stopping when you have 10 unique numbers, match the selected numbers with the individuals in your list.
The formula to find the mean of a discrete random variable.
What is add up each observation times its probability (or the formula itself)
This is the number of standard deviations away from the population parameter (mu or rho) that your sample data falls. Could be a Z or a T.
What is the test statistic (t or z)