Chapter 1
In this shape of distribution, the mean is greater than the median.
Right skewed
This is the formula you use to find a z-score.
Z = (value – mean) / sd
This is how you compute a residual.
Residual = Actual - predicted
This type of sampling divides the population into groups of individuals and then chooses separate SRSs from each group.
Stratified Random Sampling
The address of KCD.
4100 Springdale Road
These are the 5 parts of the "five number summary"
Minimum, Q1, Median, Q3, Maximum
This is the correct interpretation of z = - 1.5
1.5 standard deviations below the mean
This minimizes the sum of the squared residuals
The LSRL
This type of sampling divides the population into groups and then randomly chooses entire groups to sample.
cluster sampling
The year Mr. Cohen graduated from KCD.
2011
This rule is used to identify an outlier in a boxplot.
1.5 * IQR added to Q3 and subtracted from Q1 (The IQR Rule)
The scores on the SAT math section are normally distributed with a mean of 500 and a standard deviation of 100. what proportion of all test takers have a score of less than 650?
Normalcdf(-10000, 650, 500, 100) = .9332
What does correlation measure?
strength and direction of a linear relationship
These are the 3 (or 4) major components of experimental design.
Comparison, Control, Randomization, Replication
The faculty member Mr. Cohen's senior class dedicated their yearbook to.
Mr. Martin
The mean and the standard deviation are examples of numbers that are not..
Resistant
The scores on the SAT math scores are normally distributed with a mean of 500 and a standard deviation of 100. What score would you need to be in the top 10% of all test-takers?
invNorm(.9,500,100) = 628.155 so 630
This is when you use a regression model for prediction outside the range of values of the explanatory variable x used to obtain the line.
extrapolation
A sample is said to be this if it systematically favors or excludes part of the population.
biased
The number of the room we're in right now (don't move)
123
When comparing two distributions, you should always mention these four things.
SOCS – Shape, Outliers, Center, and Spread
The scores on the SAT math section are normally distributed with a mean of 500 and a standard deviation of 100. In what range will the middle 95% of all test-takers fall?
500+/- 200 = 300-700
When assessing if data is linear, what should you see on a residual plot?
no pattern - scattered plot
This is the main difference between an experiment and an observational study.
An experiment imposes a treatment
The part of the U.S. government that Mr. Cohen worked for.
NSA