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What is the difference between statistical significance and practical significance?

After a researcher gathers data for a study, the data typically goes into a statistical test. The results of the test also have a p-value or significance test. The most common choice for a statistical significance level is .05, which means that the probability of a relationship due to random chance is below 5 percent. The significance level helps a researcher determine whether to reject the null hypothesis, the hypothesis that states there is no relationship between the variables.\nPractical significance shows that the results of the study are meaningful beyond the likelihood of chance. In ord..

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How many pounds are in 1 kilogram?

The metric system developers originally defined the kilogram as the mass of 1,000 cubic centimeters of water, but found that standard too difficult to match due to the variations in the density of water with temperature changes. In the late 1800s, scientists created a platinum alloy cylinder equivalent to the kilogram mass. This cylinder soon became the standard for the kilogram. A second cylinder of identical materials and size replaced the first cylinder in 1889, becoming the new standard for the kilogram. As of 2014, this second cylinder remains the standard for the kilogram.

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How do you find the volume of a rectangle?

Identify the measurementsSince a rectangle is made up of unequal parts, the measurements of the length, width and height are not the same. One or two of them must be longer than the other, depending on the physical appearance of the rectangle. After identifying the three measurements, record them on a piece of paper.Calculate the volumeUse a calculator to find the volume of the rectangle by multiplying the length, width and height. However, when calculating the volume of a rectangle attached to a triangle, find the area of the base and multiply it by the height. The area of the base is found b..

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What are the factors of 26?

No numbers between two and 13 divide evenly into 26, so there are no more factors other than the four listed. Because two and 13 are both prime numbers, which are numbers that are only divisible by one and themselves, the prime factorization of 26 is 2 x 13. The prime factorization of a number refers to the prime numbers that multiply together to make that given number.

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What is the lowest common multiple of 12 and 20?

In this instance, the lowest multiples of 12 are 12, 24, 36, 48 and 60. Meanwhile, the lowest multiples of 20 are 20, 40, 60, 80 and 100. The lowest multiple that the two have in common is 60. Finding the least common multiple between two numbers, or among a set of more than two numbers, is important when adding and subtracting fractions, a process in which it's necessary to find the least common denominator.

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What is "pi r squared?"

To calculate the area of a circle, it is necessary to first determine the circle's radius, which is half the distance of a straight line across the center of the circle. The formula used to determine the circle's radius is r = C / 2.Pi is a mathematical constant representing the ratio of the circumference of a circle to its diameter, and is approximately equal to 3.14. Pi has also been represented by the Greek letter "Π" since the 18th century.The formula used to determine the area of a circle is:A = pi * r2 orA = Π * r * rWhere A represents the area, r is the radius, and pi equals..

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How is probability used in everyday life?

Probability and chance both study the possibilities of different things happening based on a few known factors. Often, scientists, mathematicians and statisticians attempt to use idealized models of the real world to predict the behaviors and outcomes of certain people and scenarios. These can be used to try and understand probability in daily life. Almost every possible activity or outcome has a probability. For example, someone might wonder about the probability they will get a high enough grade on a test they have taken or if they will be accepted for a job they applied for. Some people wor..

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Is 1/8 bigger than 1/12 ?

One-eighth represents one part of a whole that consists of eight units, but one-twelfth represents one part of a whole that consists of 12 units. Fractions are made up of numerators and denominators. Numerators are the top numbers and denominators are the bottom numbers. The numerator is the number that represents the part of a whole. The denominator is the total number of parts.

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What are the differences between a histogram vs. a bar graph?

An alternate way of expressing the way bar graphs and histograms display data is that bar graphs display nominal data while histograms display ordinal data.\nAnother difference between histograms and bar graphs is the order of the bars. In bar graphs, the bars are arranged in order of decreasing height. In histograms, the bars are arranged in the order that the classes occur.\nBar graphs are similar to pie charts in that they both display qualitative data. In a pie chart, the data that represents a trait is displayed as a piece of a pie. Each piece makes up percentage of the pie and all data c..

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What is the rule for ln x 1?

The quotient rule is similar to the product rule and can be used to express the function ln(x/1) as ln(x) - ln(1). Since ln(x*1), ln(x/1) and ln(x^1) all equal ln(x), the function can be further evaluated. For example, given that f (x) = ln(x), the derivative of ln(x) is expressed as f'(x) = 1/x. The integral of ln(x) becomes ln(x)dx = x ∙ (ln(x) - 1) + C. The ln(x) is always undefined when x is less than or equal to zero, whereas the value of ln(x) is infinite for values of x greater than zero.

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