Linear Regression
When verifying regression assumptions, this type of plot is constructed to check for constant variance and to ensure a linear model is appropriate.
What is a residual plot?
This is the primary purpose of using a control group in a well-designed experiment.
What is to provide a basis for comparison?
For two independent events A and B where P(A) = 0.4 and P(B) = 0.3, this is the exact value is P(A/B)
What is 0.58?
This is the specific percent of data expected to fall within one stdev of the mean.
What is 68% of the data?
This statistic represents for each additional unit increase in the explanatory variable, the model predicts an approximate increase of b units in the response variable.
What is the textbook definition of the slope (b) in the context of an AP Stat exam question?
This is the sampling method used to divide a population into heterogeneous groups and randomly selects an entire group to survey
What is a cluster sample?
This type of probability distribution requires a fixed number of independent trials, a constant probability of success, and a binary outcome.
What is a binomial distribution?
When data is strongly skewed to the left, this is the comparison between the mean & the median
What is the mean less than the median?
This specific type of point drastically alters the slope of the least-square regression line when removed, often sitting far away in the x-direction.
What is an influential point?
This bias occurs when someone cannot be contacted or refuses to cooperate for a survey.
What is a nonresponse bias?
This probability distribution models the number trials required until the first success if achieved.
What is a geometric distribution?
Adding a constant “C” to every point in a dataset will have THIS effect on the IQR & Standard deviation
What is no effect?
If a transformation of (x, ln(y) successfully linearizes a scatterplot, this is the functional relationship that exists between the original variables x and y.
What is an exponential model?
In a randomized block design, experimental units in blocks are explicitly created based on these criteria
What is homogeneous with respect to a variable that affects the response?
You are a real estate agent cold-calling homeowners. You know from experience that you have a 5% chance of booking an appointment on any given call. This is the distribution used to solve this
What is a geometric distribution?
This is the TI Nspire Calculator function to find the area on a normally distributed graph given z score & an upper & lower bound.
What is NormCdf?
In a computer output for a linear regression t-test for slope, this is the formula used to calculate the standard error of the slope (SE_b), which acts as the denominator of the test statistic.
What is SE_b= s_x/sqrt(n-1)?
This specific phrase is used when an observed difference is “statistically significant.”
What is the observed results are so significant that they are unlucky to occur by random chance?
When combining the independent random weights of a cereal box and its cardboard packaging, this statistical measure always increases to reflect the added chaos, whereas multiplying the cereal's weight by a fixed price per ounce will square this specific measure
What is variance?
The standard deviation of a sample, the denominator is (n-1) to make sure that standard error is this.
What is an unbiased estimator?