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mathematics
business statistics

Questions and Answers of Business Statistics

A study using college students was conducted to see if the percentage of males who pay for a date was equal to the percentage of females who pay for a date.Determine whether an observational study or
A survey was taken to see how many times in a month a person encountered a panhandler on the street.Determine whether an observational study or an experimental study was used.
Why is replication used in statistical studies?
What is the difference between a completely randomized design and a matched-pair design?
Why do researchers use randomization in statistical studies?
What is meant by blinding and double-blinding?
Define the placebo effect in a statistical study.
Explain the Hawthorne effect.
Why are a treatment group and a control group used in a statistical study?
What is the difference between independent variables and dependent variables?
What is the difference between an experimental study and a quasi-experimental study?
List some advantages and disadvantages of an experimental study.
List some advantages and disadvantages of an observational study.
Name and define the three types of observational studies.
Ten counties in Pennsylvania are randomly selected to determine the average county real estate tax that the residents pay.Identify the sampling method that was used.
For 15 minutes, all customers entering a selected Wal-Mart store on a specific day are asked how many miles from the store they live.Identify the sampling method that was used.
In a medical research study, a researcher selects a hospital and interviews all the patients that day.Identify the sampling method that was used.
In a large school district, a researcher numbers all the full-time teachers and then randomly selects 30 teachers to be interviewed.Identify the sampling method that was used.
To determine how long people exercise, a researcher interviews 5 people selected from a yoga class, 5 people selected from a weight-lifting class, 5 people selected from an aerobics class, and 5
To check the accuracy of a machine filling coffee cups, every fifth cup is selected, and the number of ounces of coffee is measured.Identify the sampling method that was used.
The average January 2012 temperature in Boston was 34.2°F. This was 5.2° higher than the normal January average temperature.Define a population that may have been used and explain how the sample
Taking statins raises the risk of developing diabetes.Define a population that may have been used and explain how the sample might have been selected.
Adults aged 19–50 need 1000 milligrams of calcium per day.Define a population that may have been used and explain how the sample might have been selected.
A researcher found that the average size of a household in the United States was 2.54 people.Define a population that may have been used and explain how the sample might have been selected.
Time magazine reported that 25% of the world’s prisoners and prisons are in the United States.Define a population that may have been used and explain how the sample might have been selected.
Time magazine reported that 83% of people with household earnings over $200,000 have a bachelor’s degree.Define a population that may have been used and explain how the sample might have been
Why are random numbers used in sampling, and how are random numbers generated?
What is meant by sampling error and nonsampling error?
Name five ways that data can be collected.
Horsepower of automobile enginesClassify following as nominal-level, ordinal-level, interval-level, or ratio-level measurement.
Online spending in dollarsClassify following as nominal-level, ordinal-level, interval-level, or ratio-level measurement.
Blood types—O, A, B, ABClassify following as nominal-level, ordinal-level, interval-level, or ratio-level measurement.
Rating of cooked ribs at a rib cook-offClassify following as nominal-level, ordinal-level, interval-level, or ratio-level measurement.
Scores on a statistical final examClassify following as nominal-level, ordinal-level, interval-level, or ratio-level measurement.
Distances communication satellites in orbit are from EarthClassify following as nominal-level, ordinal-level, interval-level, or ratio level measurement.
Classify following as nominal-level, ordinal-level, interval-level, or ratio-level measurement.Leap years: . . . 2016, 2020, 2024, . . .
Classify following as nominal-level, ordinal-level, interval-level, or ratio-level measurement.Telephone numbers
Give the boundaries of following value.19 quarts
Give the boundaries of following value.200.7 miles
Give the boundaries of following value.19.63 tons
Give the boundaries of following value.143 miles
Give the boundaries of following value.6.3 millimeters
Give the boundaries of following value.24 feet
Temperatures at a seashore resortDetermine whether the data are discrete or continuous.
Number of students in the mathematics classes during the fall semester at your school for a particular school yearDetermine whether the data are discrete or continuous.
Votes received by mayoral candidates in a city electionDetermine whether the data are discrete or continuous.
Weights of the suitcases of airline passengers on a specific flightDetermine whether the data are discrete or continuous.
Systolic blood pressure readingsDetermine whether the data are discrete or continuous.
Number of phone calls received by a 911 call center each dayDetermine whether the data are discrete or continuous.
Determine whether the data are qualitative or quantitative.Ratings of teachers
Number of degrees awarded by a college each year for the last 10 yearsDetermine whether the data are qualitative or quantitative.
Determine whether the data are qualitative or quantitative.Microwave wattage
Determine whether the data are qualitative or quantitative.Cholesterol counts for individuals
Pizza sizes (small, medium, and large)Determine whether the data are qualitative or quantitative.
Sizes of soft drinks sold by a fast-food restaurant (small, medium, and large)Determine whether the data are qualitative or quantitative.
Name and define the four types of measurement levels used in statistics.
Why are continuous variables rounded when they are used in statistical studies?
Explain the difference between qualitative variables and quantitative variables.
Forty-four percent of the people in the United States have type O blood.Determine whether descriptive or inferential statistics were used.
A survey of 1507 smartphone users showed that 38% of them purchased insurance at the same time as they purchased their phones.Determine whether descriptive or inferential statistics were used.
A study conducted by a research network found that people with fewer than 12 years of education had lower life expectancies than those with more years of education.Determine whether descriptive or
The Centers for Disease Control and Prevention estimated that for a specific school year, 7% of children in kindergartens in the state of Oregon had nonmedical waivers for vaccinations.Determine
A recent article stated that over 38 million U.S. adults binge-drink alcohol.Determine whether descriptive or inferential statistics were used.
Based on a sample of 2739 respondents, it is estimated that pet owners spent a total of 14 billion dollars on veterinarian care for their pets.Determine whether descriptive or inferential statistics
In a weight loss study using teenagers at Boston University, 52% of the group said that they lost weight and kept it off by counting calories.Determine whether descriptive or inferential statistics
In 2025, the world population is predicted to be 8 billion people.Determine whether descriptive or inferential statistics were used.
Because of the current economy, 49% of 18- to 34- yearolds have taken a job to pay the bills.Determine whether descriptive or inferential statistics were used.
What is meant by a biased sample?
Why is information obtained from samples used more often than information obtained from populations?
Name three areas where probability is used.
How does a population differ from a sample?
What is meant by a census?

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