AP Stats Chapter 4 Vocabulary

Match the following:

• r²

• Coefficient of Determination

• r

• Correlation Coefficient

• b

• Slope

• a

• Standard Deviation of Residuals

• s

• Y-Intercept

Match the following

• Scatterplot

• Model that minimizes

  the sum of the squares of the residuals and

  contains the point (x̄, ȳ)

• Extrapolation

• Shows two numeric values for each observation, one corresponding to the value on the x-axis and one corresponding to the value on the y-axis.

• LSRL

• _____ in regression is any point that, if removed, changes the relationship substantially.

• Influential Point

• _____ in regression has a

  substantially larger or smaller x-value than the

  other observations have.

• High-Leverage Point

• Predicting a response value

  using a value for the explanatory variable that is

  beyond the interval of x-values used to determine

  the regression line

What does r² stand for?

• correlation coefficient

• coefficient of determination

• slope of the line of best fit (LOBF) for a sample

• slope of the line of best fit (LOBF) for a population

What does this symbol represent?

• population proportion

• parameter

• sample proportion

• population sample

A weak negative correlation has a r close to _______

• -1

• -0.49

• 0.93

• 0

The names of 70 contestants are written on 70 cards, The cards are placed in a bag, and three names are picked from the bag.

• SRS

• Systematic

• Stratified

• Cluster

• Convenience

Identify the sampling method:

A community college student interviews the first 100 students to enter the building to determine the percentage of students that own a car.

• SRS

• Stratified

• Cluster

• Convenience

• Voluntary Response

A company determines the mean and standard deviation of the employees' salaries in one year. What is the best description of the standard deviation?

• Approximately the median distance between the individual salaries of employees and the mean of every employee's salary.

• The amount of money separating the highest salary from the lowest salary when considering the middle 50% of the distribution.

• The amount of money separating the highest salary from the lowest salary when considering all employees.

• The distance between the salary of an employee and the mean salary of all the employees.

• Approximately the mean distance between the individual salaries of employees and the mean of all employees' salaries.