WGU - APPLIED HEALTHCARE STATISTICS| 141 QUESTIONS AND ANSWERS

Rational numbers Largest number system Rational numbers Can be expressed as a fraction. 4 = 4/1. Also decimals that end or continue forever repeating. Real numbers Any number; Include zero, negative and positive integers. Real numbers are considered this. continuous and can be measured. Discrete data counted; doesn't allow for values between. Every positive whole number has two square roots. True Identity Property Property that 0 can be added to any number without changing the value of the number. Likewise, 1 can be multiplied by any number without changing the value of that number. Factor An integer that divides another integer. We say an integer, x, is a factor of another integer, y, if the quotient y/x is also equal to an integer. Fundamental Theorem of Arithmetic Concept which states that any integer greater than 1 is either prime or is the product of a unique set of prime numbers. Factorization Process of determining the prime factors of a composite number. data Values; qualitative or quantitative. Square root is only a real number base number of outcomes Percentage proportion is always set up to express percentage value over 100 conditional proportion proportion where one part of a proportion is a variable, or unknown quantity. cross multiplying method used to prove that a proportion is true. rate ratio that compares two quantities having different units of measure. unit multiplier fraction that contains two equivalent quantities but in two different units, used in order to convert units. unit conversion method used to change between measurement systems. all real numbers with a fixed value, prime, composite, odd, even, rational, or irrational. constants 0 expression known as a constant. 1 expression known as linear. 2 expression known as quadratic. 3 expression known as cubic. False Process for undoing multiplication and division operations will always work, even if one of the numbers is zero. A variable with an exponent of 0 is equal to 1 root of a number non-linear most simple algebraic equations are linear equations two terms or expressions with an equals sign between them is an equation origin; where x and y intersect. 0, 0 linear; degree 1 straight line slope-intercept form y = mx + b point-slope form y - y1 = m(x - x1) large coefficient steep line small coefficient gentle slope algebraic expression String of terms connected by division, addition, and subtraction. variance A measure of spread within a distribution (the square of the standard deviation). Qualitative categorical; in groups; names or labels; pie charts or bar charts. Quantitative number; counted, measured bar charts categorical; counts, frequency of category. graphic; quantitative data dot plots, stem plots, box plots, histograms dot plot quantitative; distribution; clusters, gaps, outliers; small sets. stem plot quantitative; distribution; shape box plot quantitative; distribution; center; spread; outliers in a given data set. histogram quantitative; frequency; count; shape and spread, intervals. distribution of quantitative data Shape, spread, max, min, outlier graphic; quantitative symmetry, skew, U-shaped; uniform; bi-modal; approximately normal. pie chart categorical; different parts of a whole. In a dot plot, depending on the data collected, every data value or groups of data values can be represented by a dot. False The first step in building a dot plot is to draw a horizontal scale. False; first arrange data in increasing order. histogram; quantitative frequencies; relative frequency bar chart; categorical frequency, counts, or relative frequencies. symmetric does not mean normal bell curve asymmetry skewness data set numerical values, measurements, observations, or survey responses. valid data result from test that accurately measures what it was intended to measure. numerical summary number used to describe a specific characteristic about a data set. measure of central tendency summary measure used to describe an entire set of data with one value that represents the middle or center of the data set's distribution; mean, median, or mode. measures of the center mean, median, mode median resistant measure of center Interquartile Range measures difference between the 3rd and 1st quartile. Standard Deviation how far, on average, the data points are from the mean. five-number summary min, max, median, 1st quartile, 3rd quartile in a set of data. Standard Deviation Rule 68% of data will fall within 1 SD of the mean, 95% will fall within 2 SD of mean, and 99.7% will fall within 3 SD of mean, 0.15% will fall below 3SD.