MATH 120 UNIT 1 TEST REVIEW QUESTIONS WITH
VERIFIED ANSWERS
Define statistics. - Answers - The science of collecting, organizing, summarizing, and
analyzing information to draw a conclusion and answer questions. Providing a measure
of confidence in any conclusion.
A(n)______is a person or object that is a member of the population being studied. -
Answers - Individual
________ statistics consist of organizing and summarizing information collected, while
________ statistics uses methods that generalize results obtained from a sample to the
population and measure the reliability of the results. - Answers - Descriptive, Inferential
A ________ numerical summary of a sample. A ________ numerical summary of a
population. - Answers - Statistic, Parameter
________ are the characteristics of the individuals of the population being studied. -
Answers - Variables
A sample of professors is selected and it is found that 55% own a computer. - Answers -
Statistic because the value is a numerical measurement describing a characteristic of a
sample.
The average annual salary of 50 of a company's 800 employees is $54,000. - Answers -
Statistic because the data set of salaries of 50 employees is a sample.
National survey substance abuse, 66.4% of respondents who were full-time college
students aged 18 to 22 reported using alcohol within the past month. - Answers - The
value is a statistic because the respondents who were full time college students aged
18 to 22 are a sample.
Goals scored in a hockey game. - Answers - Quantitative, numerical measure
Height - Answers - Quantitative, numerical measure
Favorite song - Answers - Qualitative, attribute classification
Number of beats in a song - Answers - Discrete, countable
Weight carried by a soldier in combat - Answers - Continuous, not countable
Number of aces held in a poker hand - Answers - Discrete, countable
, The rankings of songs in the top 100 - Answers - Ordinal
Years of elections: 1988, 1990, 1992, 1994, and 1996 - Answers - Interval
Highest degree conferred (high school, bachelors, and so on) - Answers - Ordinal
Movie ratings with 5 stars - Answers - Ordinal
The gallup organization contacts 2290 undergraduates who attended a university and
live in the US and asks wether or not they had spent more than $200 on food in the last
month.
What is the population in the study?
What is the sample? - Answers - Undergrads who attend a university and live in the US.
The 2290 undergrads who attend a university and live in the US.
A quality-control manager randomly selects 20 bottles of bleach that were filled on
November 11 to assess the calibration of the filling machine.
What is the population in the study?
What is the sample in the study? - Answers - Bottles of bleach produced in the plant on
November 11.
20 Bottles of bleach produced in the plant on November 11.
Study of widescreen high-definition Televisions
Setup: A, B, C, D, E
Size (in): 59, 41, 55, 55, 45
Screen type: Plasma, Projection, Projection, Projection, Plasma
Number of Channels: 298, 113, 425, 269, 290
What are the individuals?
What are the variables and corresponding data?
Size is a _____ variable.
Screen type ______ variable.
Number of channels _________ variable. - Answers - The setups A through E of
widescreen high-def TVs
Size (59, 41, 55, 55, 45) screen type (Plasma, Projection, Projection, Plasma) and
Number of channels (298, 113, 425, 269, 290)
Continuous
Qualitative
Discrete
If a researcher wanted to describe countries based on ISBN group identifier, what level
of measurement would "ISBN group identifier" be?
Now researchers felt that certain countries with greater populations received higher
identifying numbers. Does the level of measurement of the variable change? If so, how?
- Answers - Nominal
VERIFIED ANSWERS
Define statistics. - Answers - The science of collecting, organizing, summarizing, and
analyzing information to draw a conclusion and answer questions. Providing a measure
of confidence in any conclusion.
A(n)______is a person or object that is a member of the population being studied. -
Answers - Individual
________ statistics consist of organizing and summarizing information collected, while
________ statistics uses methods that generalize results obtained from a sample to the
population and measure the reliability of the results. - Answers - Descriptive, Inferential
A ________ numerical summary of a sample. A ________ numerical summary of a
population. - Answers - Statistic, Parameter
________ are the characteristics of the individuals of the population being studied. -
Answers - Variables
A sample of professors is selected and it is found that 55% own a computer. - Answers -
Statistic because the value is a numerical measurement describing a characteristic of a
sample.
The average annual salary of 50 of a company's 800 employees is $54,000. - Answers -
Statistic because the data set of salaries of 50 employees is a sample.
National survey substance abuse, 66.4% of respondents who were full-time college
students aged 18 to 22 reported using alcohol within the past month. - Answers - The
value is a statistic because the respondents who were full time college students aged
18 to 22 are a sample.
Goals scored in a hockey game. - Answers - Quantitative, numerical measure
Height - Answers - Quantitative, numerical measure
Favorite song - Answers - Qualitative, attribute classification
Number of beats in a song - Answers - Discrete, countable
Weight carried by a soldier in combat - Answers - Continuous, not countable
Number of aces held in a poker hand - Answers - Discrete, countable
, The rankings of songs in the top 100 - Answers - Ordinal
Years of elections: 1988, 1990, 1992, 1994, and 1996 - Answers - Interval
Highest degree conferred (high school, bachelors, and so on) - Answers - Ordinal
Movie ratings with 5 stars - Answers - Ordinal
The gallup organization contacts 2290 undergraduates who attended a university and
live in the US and asks wether or not they had spent more than $200 on food in the last
month.
What is the population in the study?
What is the sample? - Answers - Undergrads who attend a university and live in the US.
The 2290 undergrads who attend a university and live in the US.
A quality-control manager randomly selects 20 bottles of bleach that were filled on
November 11 to assess the calibration of the filling machine.
What is the population in the study?
What is the sample in the study? - Answers - Bottles of bleach produced in the plant on
November 11.
20 Bottles of bleach produced in the plant on November 11.
Study of widescreen high-definition Televisions
Setup: A, B, C, D, E
Size (in): 59, 41, 55, 55, 45
Screen type: Plasma, Projection, Projection, Projection, Plasma
Number of Channels: 298, 113, 425, 269, 290
What are the individuals?
What are the variables and corresponding data?
Size is a _____ variable.
Screen type ______ variable.
Number of channels _________ variable. - Answers - The setups A through E of
widescreen high-def TVs
Size (59, 41, 55, 55, 45) screen type (Plasma, Projection, Projection, Plasma) and
Number of channels (298, 113, 425, 269, 290)
Continuous
Qualitative
Discrete
If a researcher wanted to describe countries based on ISBN group identifier, what level
of measurement would "ISBN group identifier" be?
Now researchers felt that certain countries with greater populations received higher
identifying numbers. Does the level of measurement of the variable change? If so, how?
- Answers - Nominal
