STATS Ch 1 Exam 1
Which of the following is true?
No matter what your career, you need a knowledge of statistics to understand the world.
Identify all of the following items which are quantitative variables.
The weight of a Siamese cat. The miles per gallon for a particular model of car.
Which of the following are attributes of a discrete quantitative variable? Choose all that apply.
There are gaps between the values of this variable. It can be used to count items, in which case it can only have integer values. It can assume only certain values within a range.
Which of the following is an example of a continuous variable?
Tons of concrete to complete a parking garage
Which of the following are discrete variables? Choose all that apply.
The number of cars for sale on a used car lot. The number of customers using an ATM on a given day.
Which of the following are examples of descriptive statistics? Select all that apply.
Calculating summary measures of the prices of houses sold in Las Vegas in January. Creating a pie chart to show majors of students in your business statistics class.
Which of the following is the best definition of a statistical sample?
A portion, or part of the population of interest.
Which one of the following is a population in the statistical sense?
All of the automobiles sold in Canada in 2016.
What level of data is represented by the fire risk (Low, Moderate, High or Severe) today in Arapahoe National Forest?
Ordinal
What level of measurement were data on the consecutive exit numbers?
Ordinal
The names of the positions in a corporation, such as chief operating officer or controller, are examples of what type of variable?
Qualitative
Ethical statisticians
use honesty and integrity when summarizing, analyzing, and interpreting data.
Which level of data gives the most information about the observation?
Ratio
Your height and weight are examples of which level of measurement?
Ratio
The main purpose of descriptive statistics is to
summarize data in a useful and informative manner.
Which of the following variables is recorded at the ratio level of measurement?
Salaries of business school graduates.
When statisticians analyze sample data in order to draw conclusions about the characteristics of a population, this is referred to as
statistical inference.
The general process of gathering, organizing, summarizing, analyzing, and interpreting data is called
statistics
Which is the best definition of a quantitative variable?
A variable that can be reported numerically
Which of the following is not part of the science of statistics?
Choosing data that supports your conclusion.
What level of measurement is the Centigrade temperature scale?
Interval
An example of a qualitative variable is
color of ink in a pen.
Which of the following represents data recorded at the nominal level?
Brand of newly purchased TV.
What type of variable is the number of auto accidents reported in a given month?
Discrete
The nominal level of data describes what type of information?
Observations of a qualitative variable that can only be classified and counted.
What is inferential statistics?
Methods of estimating a property of a population based on a sample.
Which of the following are examples of how organizations use statistics?
Retailers use product purchase data to manage the distribution of products and make marketing and sales decisions. Google uses search engine data records to prioritize results for future searches.
How does statistics help us understand large amounts of numerical information?
A good working knowledge of statistics is useful to organize and summarize information.
Identify which one of the following is a continuous quantitative variable.
The average weight of apples in a box at the market.
Which one of the following are properties of ordinal-level data?
The data can be ranked or counted.
Which of the following is the best definition of a statistical population?
The entire set of individuals, objects or measurements of interest.
Which of the following represent statistical information? Select all that apply.
The median income in Wasau County is $40,578 per year. Lucky's Market sells a maximum of 240 kilograms of apples per month. On average there are 12.5 chocolate chips in a Chips Hello cookie.
The two categories of statistical study are:
descriptive statistics and inferential statistics
Identify all of the following items which are qualitative variables.
A person's favorite food type. The colors in a package of M&M's. The species of trees in a park.
True or false: Statistics knowledge is necessary to successfully use business analytics.
True because the knowledge of statistics is necessary to successfully use business analytics.
What type of variable is the number of robberies reported in your city?
Quantitative
The incomes of 50 loan applicants are obtained. Which level of measurement is income?
Ratio
The reported unemployment is 5.5% of the population. What level of measurement is used to measure unemployment?
Ratio
What level of data is represented by th What level of data is represented by the ages of patients in a local hospital?
Ratio
What level of measurement are data on the milepost numbers?
Ratio
Which of the following is classified as ordinal-level data?
Someone's ranking of their three favorite foods.
Which of the following are reasons to study statistics? Select all that apply.
Statistics are used to make personal and professional decisions Statistical knowledge is needed to understand the world and be conversant in your career. Data is collected everywhere, and statistics is needed to translate that data into useful information.
Which three of the following are not proper and ethical activities for a statistician in working with data
Use samples that represent only a desired part of a population, Remove outliers that bias the data too far in one direction. Report only those statistics that support his conclusions.
A study to find the quality of matchsticks in a bundle of 100 matchboxes.
Sample
An evaluation of the creativity of the director of three films.
Population
A survey to rank the famous television shows in the United States.
Sample
Which of the following are properties of ratio-level data? Choose all that apply.
It has all the properties of interval-level data. The zero point of the data is meaningful. The ratio between two measures is meaningful.
Which of the following best describes interval-level data?
The distance between values is a known unit of measure.
Which of the following examples are statistics? Select all that apply.
The number of home runs in last year's World Series. Yesterday's share price for Proctor and Gamble stocks. The median price of a house in Detroit.
A survey includes a question about marital status that has the following responses: single, married, divorced, separated, or widowed. What is the level of measurement for this question?
Nominal
Which of the following are attributes of a continuous quantitative variable? Choose all that apply.
It is typically the result of measuring something. It can take on any value within a range of values. There are no required gaps between values.
Match the following levels of data to the description of the observations.
Nominal -The types of fruit in a grocery store. Ordinal - Movie ratings. Interval -Shoe sizes. Ratio - Stock prices.
A marketing class of 50 students evaluated the instructor using the following scale: superior, good, average, poor, or inferior. The descriptive summary showed the following survey results: 2% superior, 8% good, 45% average, 45% poor, and 0% inferior.
A marketing class of 50 students evaluated the instructor using the following scale: superior, good, average, poor, or inferior. The descriptive summary showed the following survey results: 2% superior, 8% good, 45% average, 45% poor, and 0% inferior.
What are the two types of quantitative variables?
Discrete and Continuous.
Which of the following are example of inferential statistics? Select all that apply.
Estimating the average weight in a box of apples by measuring the weight of five apples. Counting the blue candies in a package of M&M's as a way to estimate the proportion of blue candies in all packages.
Which three of the following are samples in the statistical sense?
Every eighth person on the class roster. Ten apples selected from a grocery store bin containing 100 apples. Six randomly chosen books from the library.
A university wishes to conduct a student survey. In one of the questions students are asked to mark their gender as either male or female. Gender is an example of the
nominal scale
A portion or part of a population is called a
Sample
What type of variable is "pounds of popcorn" served at a movie theater?
Continuous
Which of the following are the four levels of measurement possible for data?
Interval level Ordinal-level Nominal-level Ratio-level
A research project to find how many heart attack patients are admitted on January 1 to a famous hospital.
Population
True or False: The primary purpose of statistics is to present numerical data.
False because statistics is about collecting and processing information to provide a basis for decision making.
Which of the following variables is recorded at the interval level of measurement?
A man's shoe size.
Which best describes the purpose of business analytics?
Business analytics is used to process and analyze data and information to support a story or narrative of a company's business.
Descriptive statistics uses the data to make inferences and predictions about a population based on a sample of data taken from the population in question.
False because inferential statistics makes predictions about a population based on a sample of data taken from the population.
What is descriptive statistics?
Methods of organizing, summarizing, and presenting data in an informative way.
How has technology increased the need for statistical analysis?
Vast amounts of data are collected, and understanding it requires statistical knowledge.
Which of the following best describes the role of a statistician in working with data?
He should strive to present his analysis with clarity, honesty, and integrity.
The newer system provided information on the distance between exits.
True