# MQM 100 Chp 1-3

continuous variable

variable that can assume an uncountable set of values

data set

is a collection of observations on one or more variables

discrete variable

variable that can assume a countable set of values only

observation

is a value of a variable for a single element

qualitative variable

only type of variable that cannot be measured numerically

quantitative variable

only type of variable that can assume numeric values for which arithmetic operations make sense

random sample

sample drawn in such a way that each member of the population has some chance of being included in the sample

population

all subjects or objects whose characteristics are being studied

representative sample

sample that contains the characteristics of the population as closely as possible

conducting a census means

collecting information from all members of the population

conducting a survey means

collecting information from elements

Time-series data are collected

on the same element for the same variable at different points in time

Under descriptive statistics, we study

the methods for organizing, displaying, and describing data

Under inferential statistics, we study

the methods to make decisions about one or more populations based on sample results

A distribution curve that is right-skewed has

a longer tail on the right side

An outlier influences which of the following summary measures the most?

mean

If a data set is right-skewed with one peak in the histogram, then which of the following is true?

the mean is greater than the median, which is greater than the mode

The value of the third quartile for a data set is 65. This means that

75% of the values in that data set are smaller than 65

Please follow and like us: