Statistics

A:

Direct variation exists when a worker is paid based on the number of hours worked. Another example of a direct variation is a taxi fare that varies according to the distance traveled. Direct variation occurs with two variables when the ratio of their values always remains the same. For example, if the value of A is always twice as much as B, they vary directly.

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  • Who Is the Father of Statistics?

    Q: Who Is the Father of Statistics?

    A: Sir Ronald Aylmer Fisher, a British statistician, is considered by many to be the father of the modern science of statistics. The Danish statistician Anders Hald recognized him as a genius who built the foundations for modern statistical science, according to Wikipedia.
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  • What Is the Importance of Statistics in Business?

    Q: What Is the Importance of Statistics in Business?

    A: There's an old saying in business: If you can measure it, you can manage it. What's measurable is almost always presented in the form of statistics.
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  • What Is a Good Statistical Sample Size?

    Q: What Is a Good Statistical Sample Size?

    A: A good statistical sample size is at least 100, and preferably more, participants. With a 100-participant sample size, the researcher has a margin of error of approximately 10 percent with a 95 percent confidence rating in the results. For the researcher to increase his confidence rating and reduce his margin of error he has to increase the size of the sample.
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  • What Is the Role of Statistics in Research?

    Q: What Is the Role of Statistics in Research?

    A: Statistics play an important role in research of almost any kind because they deal with easily-quantified data. When working in fields such as science or medicine, trials are needed, and experimental data has to be collected and analyzed. The study of statistics enables researchers to look at a large set of data and condense it into meaningful information.
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  • What Are the Advantages and Disadvantages of Using Statistics?

    Q: What Are the Advantages and Disadvantages of Using Statistics?

    A: Statistics allow people to analyze surveys, experiments and other data, but they are easy to misrepresent or to use to mislead others. Statistical data is essential to the scientific method. It also helps companies, governments and other entities make decisions.
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  • What Is the Definition of "presentation of Data"?

    Q: What Is the Definition of "presentation of Data"?

    A: The presentation of data refers to how mathematicians and scientists summarize and present data related to scientific studies and research. In order to present their points, they use various techniques and tools to condense and summarize their findings. These tools include the use of tables, graphs and subsets to provide an overview of their calculations and the data they have mined.
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  • What Does "marginal Probability" Mean?

    Q: What Does "marginal Probability" Mean?

    A: Probabilities may be marginal, joint or conditional. A marginal probability is the probability of a single event happening. It is not conditional on any other event occurring.
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  • What Is the Difference Between the Dependent Variable, the Independent Variable and the Controlled Variable?

    Q: What Is the Difference Between the Dependent Variable, the Independent Variable and the Controlled Variable?

    A: The difference between the independent, dependent and control variables rests with the way each variable impacts research. The dependent variable is the item under observation, the independent variable receives manipulation by a researcher and the control variable is an aspect that affects the dependent variable if the researcher does not hold it constant, explains Nuffield Foundation. These variables form the basis of an experiment or observation.
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  • How Do You Measure Effectiveness and Efficiency?

    Q: How Do You Measure Effectiveness and Efficiency?

    A: Effectiveness and efficiency are measured by how rapidly change is expressed in organizational systems and how great the difference is over time. This allows companies to compare workforce performance before and after a change is made. Effectiveness and efficiency look at return on investment, employee engagement, client satisfaction and positive gains versus negative side effects of an endeavor.
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  • What Is the Difference Between a Parameter and a Statistic?

    Q: What Is the Difference Between a Parameter and a Statistic?

    A: A statistic describes a sample, while a parameter describes an entire population. A sample is a smaller subset that is representative of a larger population.
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  • How Do You Calculate Jelly Beans in a Jar?

    Q: How Do You Calculate Jelly Beans in a Jar?

    A: To calculate the number of jellybeans in a jar, count the number of jellybeans on the top layer of the jar. Then, count the number of jellybeans going down the side of the jar, and multiply that number by the number of jellybeans in the top layer to get an estimate of the number of jellybeans in the jar.
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  • What Is the Outlier in a Math Problem?

    Q: What Is the Outlier in a Math Problem?

    A: In math, outliers are observations or data points that lie an abnormal distance away from all of the other values in a sample. Outliers are usually disregarded in statistics because they can skew calculations and cause the final statistical analyses to be invalid.
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  • What Is the Importance of Statistics in Economics?

    Q: What Is the Importance of Statistics in Economics?

    A: The importance of statistics in economics starts with economics research methods. These are used to collect and analyze data for factors, such as per capita income and inflation rate.
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  • What Percentage of Our Lives Are Spent Working?

    Q: What Percentage of Our Lives Are Spent Working?

    A: About one-third or 30 percent of human life is spent working. The average working week in the United States consists of 40 hours of work. Most people take a few holidays every year. On an average, most people spend about 25 to 30 years working.
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  • What Are the Disadvantages of Simple Random Sampling?

    Q: What Are the Disadvantages of Simple Random Sampling?

    A: Although simple random samplings are a common research method, they are expensive to use, extremely time consuming and difficult to organize. A simple random sampling requires a complete list of all members of the target population so that the sample is a real representation of the larger group. Each individual in the population has the same chance of becoming part of the sample. All possible combinations of the sample are equally likely to occur, as well.
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  • What Is a Criterion Variable?

    Q: What Is a Criterion Variable?

    A: According to the University of Connecticut, the criterion variable is the dependent variable, or Y hat, in a regression analysis. The criterion variable is the variable that the analysis predicts. The number given from the analysis fits into the regression line.
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  • What Does Frequency Mean in Mathematics?

    Q: What Does Frequency Mean in Mathematics?

    A: In math, the frequency is the number of times a specific value appears in a data set or list. To find the frequency of these values, one constructs a frequency table and inputs all the different values from the set.
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  • What Are the Odds of Getting Hit by a Car?

    Q: What Are the Odds of Getting Hit by a Car?

    A: Based on information provided by the Centers for Disease Control, the odds of being struck by a car in the United States is about one in 4,292. The odds of dying as the result of being struck by a car are about one in 47,273.
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  • How Many Babies Are Born Each Year?

    Q: How Many Babies Are Born Each Year?

    A: According to UNICEF article updated in May 2012, about 130 million babies are born each year. CNN notes that an accurate count of the worldwide birth rate is difficult since many countries don't register all new births.
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  • How Are Statistics Used in Accounting?

    Q: How Are Statistics Used in Accounting?

    A: Accountants in various fields, including auditors, forensic accountants, controllers and risk accountants, use statistics to accomplish their professional duties. Accountants who conduct audits use samples that are statistically representative of a data base because it is almost impossible to collect all the data needed in a short period of time. Auditors typically use this method when conducting a reliability assessment to determine the accuracy of the data being audited.
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  • How Big Is a Cereal Box?

    Q: How Big Is a Cereal Box?

    A: Cereal box size depends on the cereal brand and the volume size. For example, a box that is 12 inches long, 7 5/8 inches wide and 2 1/2 inches deep is required to hold 12.8 ounces of Multi Grain Cheerios.
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