Ch 3

In a data set, the 25th percentile, or equivalently, the

First quartile

Quartiles divide the data into _____ equal parts

Four

Generally, the _______ is the best measure of central location when outliers are present

Median

In the neighborhood there are five houses listed for sale for the following amounts: $250,000, $275,000, $280,000, $295,000, and $515,000. What is the best measure of central location for the price of a house in the neighborhood?

Median

The measure of central location that can best be labeled as the midpoint of the data set is the

Median

The measure of central location where half the values of the data set lie above this measure and half the values of the data set by below this measure is known as the

Median

The arithmetic mean is usually not a good measure of central location is a ________ exists

Outlier

Extremely small or large values, also referred to as

Outliers

The mean is usually greater than the median when the data are ________ skewed

Positively

Match these quartiles with their percentiles

Q1 ——-> 25th percentile Q2——-> 50th percentile Q3———> 75th percentile Q4———-> 100th percentile

The function to find the mean of a subset in excel is

AVERAGEIF

The term _________ _______ relates to the way data tend to cluster around some middle or central value

Central location

The pth Percentile divides a variable into two parts. What percentage is greater than P?

(100-p)

In order to calculate the arithmetic mean, one

Add all of the data points, then divides by the number of data points

The pth percentile divides a variable into two parts. What percentage is less than the pth percentile?

Approximately P percent

The _______ is not considered a good measure of dispersion because it focuses solely on the extreme values and ignores every other observation in the sample or the population

Range

The _______ measures the difference between the largest and smallest values in a data set

Range

The function to find the mean of a subset an R is

TApply

Which of the following values is included in a box plot?

The first quartile

Which of the following values is included in a box plot

The second quartile

The formula for the weighted mean is x=EwiXi

They must sum to one

The modes usefulness as a measure of central location tends to diminish with variables that have more than ________ modes

Three

True or false: the main is the most widely used measure of central location for quantitative data

True

Which of the following is not a measure of central location

Variance

The mode is defined as

most frequently occurring value in the data set