Exploring One Variable Data
What is the difference between categorical and quantitative variables?
Categorical→categories/words and Quantitative→numbers
What is the best r(correlation) value for your line to be very strong and positive?
r=1
What is the difference between a population and sample?
The population is the entire group of individuals we want information about and the sample is a subset of individuals in the population
What is an example of a device you can use to randomly assign in a simulation?
Dice, coin, RandInt, etc
What is Large Counts?
The expected # of successes and failures are at least 10
What 5 things do you need in your answer to describe a distribution?
Context, shape, unusual features, center, and variability
What 5 things do you need in your answer to describe a relationship in a scatterplot?
Context, strength, direction, form, and unusual features?
What is the sampling method that selects individuals from the population who are easy to reach?
Convenience sample
What is the definition of a complement?
The probability of an event not happening
What condition states that the sample has to be at least 10% of the population?
10% Condition
What is an advantage and disadvantage of using a boxplot?
Advantages is that it helps you see all data, ordered least to greatest while some disadvantages is that some scales make it difficulty to see all values, can be overwhelming for large data sets
What is one thing missing in this predicted line of best fit: y=a+bx?
The hat over the p or describing x=__ and y=__?
What is the undercoverage bias definition?
Some members of a population cannot or are less likely to be included in a sample
What is the term called for events that cannot occur together?
Mutually exclusive
What is the difference between a parameter and statistic?
The parameter describes a population and the statistic describes a sample
How would the mean and median compare for a symmetric distribution?
The mean and median are approximately the same
What is the slope interpretation?
With each additional x-variable the predicted y-variable increases/decreases by slope value
What is a group of experimental units that are similar?
A block
The Law of Large Numbers States ____
If we do something many, many times, the proportion of desired outcomes will approach its probability
When sample size increases, variability _____
Decreases
How do you do the 1.5IQR rule to find outliers?
<Q1-1.5IQR and >Q3+1.5IQR?
What is the extrapolation definition
The use of a regression line for prediction far outside the interval of values of the explanatory variable x used to obtain the line. Such predictions are often not accurate
What is a prospective observational study?
You track and observe individuals into the future
What is the definition of Independent Events?
When knowing one event has occurred or has not occurred does not affect the probability of the second event. P(B/A)= P(B)
When Sample size increases, the mean____ and standard deviation ______
Mean would stay the same and standard deviation would decrease