Introduction to Statistics Vocabulary

using regression line to predict y values for x values within data value range

overall pattern of how data values are distributed

numerical summary of a characteristic of a sample

expresses each observation in terms of the number of standard deviations away from the mean

making an informed reliable decision about the population based on data from a random sample

Which of the following is a quantitative variable?

highest data value - lowest data value

researcher does not change the values of the explanatory variable

a table listing different categories along with their respective number of counts

pictorial display that represents the association between two quan. variables

A study was done on all US voters. 55% of Republicans said they were voting Trump

occurs when a group of people in the population are favored over others

Independent Variable

hidden explanatory variables that are not considered in the study but affect response variable

make conclusions about the whole population with a level of confidence and a margin of error

a value such that k% of the data values fall at or below that value

data value that is in the middle of the observations in order

divides data values in order into 4 equal parts

values assumes numbers from a set (hint: can be counted)

table showing categories along with the proportion or % of observations within each category

exists btwn 2 variables if the changes in one data value are more likely to occur with other

value of SD if all data values are the same

which property of mean is NOT true

value of the explanatory variable are changed and the lurking values are controlled

interviewer error; biased wording of question

sum of values / # of values

the characteristics of the population that we want to measure/observe

data value with highest freq. ; applicable to quan. and qual. data

Number of siblings?

variable assumes a numerical value (ex: weight) & mathematical operations make sense in context

values assumed from an interval (hint: can be measured)

mean > median in which scenario

summarizes data values by describing a balance point (# that best represents the bulk)

Temperature?

using the regression line to predict y values for x values beyond data range; not recommended

assesses the strength of the linear relationship between two variables

Dependent Variable

divides pop. into non-overlapping groups where individuals in each group share a characteristic

organizing and summarizing the data obtained from a research study

variable can be organized categorically (ex: favorite sport)

numerical summary of a characteristic of a population

Which of the following is a qualitative variable?

occurs when the result obtained from the sample is not representative of the population

which property of median is NOT true

difference between actual value and value predicted

mean < median in which scenario

mean = median in which scenario

You plant a tree in your yard, and collect data about the fruit harvested. What's the pop?

individuals/objects/entities of interest in a study

planning to obtain the date efficiently about the research objective