Unit 1
How do you determine if a data set has an outlier?
(Name the method)
By using the IQR Rule
What does r2 explain about the data?
r2 can tell us what percentage of the dependent variable can be explained by our independent variable.
What do we use to reduce the variability in the response variable for an experiment?
A control group
what does the variable n represent?
the number of independent trials
what does the CLT prove?
That the distribution acts normal
How much data lies between 2 standard deviations of the mean in a normal set of data and how do you know?
Name the answer and the rule
The Empirical Rule states that 95% of data falls between two standard deviations of the mean in a normal set of data.
Which is a Categorical variable and which is a Quantitative variable?
Zip Code
GPA
Zip Code is Categorical and GPA is Quantitative
Name this data collection design!
This design splits the experimental units into groups of similar individuals.
Blocked Design
does binomialcdf calculate probability using a fixed or unfixed number of trials
fixed
True or false, proportions typically deal with qualitative data
False (proportions deal with quantitative data, typically percentages)
What is it called when a subject in an experiment doesn't know what treatment they are receiving and is this ethical?
This is called blinding, and it is necessary to ensure the experiment remains ethical and unbiased.
What is a census?
A form of data collection where every person in a population is interviewed
What occurs when some individuals are not able to be part of the sample?
Undercoverage
What are the 3 probabilty distribution requirements?
There is a numerical (not categorical) variable, and each value of X has an associated probability with it.
The sum of all probabilities must be = 1.
0 ≤ P(X) ≤ 1 for all probabilities in the distribution.
what is the 10% rule for
to see if the data is independent
What acronym can be followed to answer the question "Describe the distribution," and what does the acronym stand for?
The acronym is SOCS, and it stands for Shape, Outliers, Center and Spread.
What numerical value describes how far away from our calculated expected value our observed value is?
A Residual
What is the naturally occurring difference between the sample result and the population result called?
Sampling Error
What are the four conditions for the Bernoulli Trials
Two Possible Outcomes, A Fixed Probablility, Independance, and a Fixed Number of Trials
true or false, accuracy is how close a response is to a response is to correct and presicion is how close together the responses are
true
What law states that a person can't make factual short-term predictions based on statistical probabilities?
Ex: a coin flip has a 50/50 chance to be heads or tails. If you flip one heads, you can't guarantee the next flip will be tails.
The Law of Averages
What are the three qualities of a good experiment?
Comparison, Randomization, and Replication
What is an unmeasured variable that affects both factors and response?
A Confounding Variable
What can this equation prove?
P(A ∩ B) = P(A) * P(B) or P(B|A) = P(B)
Independence between two events
true or false: A continuous random variable is a variable that can take any value on the number line.
true