random variable that follows a Standard Normal Distribution

A group of individuals or objects that you may want to study.

The subset, or part, of the population to be studied.

A sample in which every element in the population has an equal chance of being selected. Synonym: Simple Random Sample Example: Drawing names out of a hat or generating random numbers.

A sample in which some members of the population are more likely to be chosen than others. Examples: Convenience, Voluntary Response

A sample in which all members of the population have an equal chance of being chosen. Synonym: Representative Sample Examples: Simple Random, Stratified, Systematic

A sample that is easy to obtain. This type of sampling method is biased. Example: You survey your family members at the breakfast table.

Self-selected Response

A sample that depends on people volunteering to participate. This sampling method is biased. Example: A survey sent through the mail.

Stratified Random Sample

An unbiased sample in which the population is grouped first and then the sample is randomly selected from each group Example: The middle school students are broken into homerooms, then 5 girls and 5 boys are randomly selected from each homeroom by drawing names from a hat.

Systematic Random Sample

An unbiased sample in which members of the population are selected systematically or in an organized way. Every nth person is selected. Example: Every 3rd person to enter the school in the morning is selected.

The arithmetic average of a set of data. It is obtained by finding the sum of the numbers in the data set, then dividing by the number of numbers.

The middle number of a set of data.

The number that occurs most frequently in a data set. There may be more than one, or there may not be any.

The difference between the highest and lowest values in the data set.

In a set of numbers, how widely dispersed the values are from each other and from the mean.

Standard Deviation (SD)

measures the average difference between each score and the mean of the data set

a measure of how many standard deviations you are away from the norm (average or mean)

In an experiment, the group that is exposed to the treatment, that is, to one version of the independent variable.

In an experiment, the group that is not exposed to the treatment; contrasts with the experimental group and serves as a comparison for evaluating the effect of the treatment.

observes individuals and measures variables of interest but does not attempt to influence the responses

numerical summary of a population

an imitation of an event; a reproduction of an event that is similar to the actual event

randomized comparative experiment

subjects are randomly assigned to the control group or the treatment group

The process of selecting representative units from a total population

statistics and symbols Flashcards

Student preview

35 questions

Show all answers

1.

FLASHCARD QUESTION

Front

population standard deviation

Back

σ

Answer explanation

σ

2.

FLASHCARD QUESTION

Front

Sample mean

Back

(x-bar)

Answer explanation

(x-bar)

3.

FLASHCARD QUESTION

Front

σ

Back

population standard deviation

Answer explanation

population standard deviation

4.

FLASHCARD QUESTION

Front

Σ

Back

summation

Answer explanation

summation

5.

FLASHCARD QUESTION

Front

x̄

Back

sample mean

Answer explanation

sample mean

6.

FLASHCARD QUESTION

Front

Q1

Back

first quartile

Answer explanation

first quartile

7.

FLASHCARD QUESTION

Front

Q2

Back

second quartile, median

Answer explanation

second quartile, median

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statistics and symbols

35 questions

σ

(x-bar)

population standard deviation

summation

sample mean

first quartile

second quartile, median

third quartile

Interquartile range

random variable that follows a Standard Normal Distribution

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