WGU C955 Applied Probability and Statistics Exam Questions & Answers

Discrete data - Answer Has distinct values, can be counted, had unconnected points (think dots) Continuous data - Answer Has values within a range, measured not counted, does not have gaps between data points (data is connected lines or curves). Example of discrete data - Answer Days of the week Expressions - Answer A group of symbols such as numbers and operators that has mathematical validity Commutative - Answer The order in which the numbers appear in the sum can be reversed Identity property - Answer Adding 0 to any number does not change the original number Additive inverse - Answer Values that are equally far from 0 on the number line. Negative - Answer When multiplying a positive number by a negative number the result is always Positive - Answer Multiplying a negative number by a negative number results in a positive Factors - Answer Integers that evenly divide the initial integer Prime number - Answer Positive integer with exactly two positive factors consisting of 1 and itself Composite number - Answer Has at least one positive factor other than one and itself Factorization - Answer Process of breaking up a composite number into its prime factors fundamental theorem of arithmetic - Answer Any integer greater than one is either Prime or the product of Prime numbers Principal square root - Answer Positive square root of a number Radican - Answer Number under radical sign √16=4 Open Circle - Answer Represents less than or greatest than on the number line Perfect square - Answer Product of any integer with itself yields a perfect square. Whole numbers - Answer positive numbers with a whole value Integers - Answer Numbers with no fractions or decimal value but can be positive or negative Rational numbers - Answer Numbers that can be expressed as a fraction or decimal values that have that end or repeat forever. Includes all integers since all integers can be expressed as fractions. Real numbers - Answer Everything that can be included in a number line including pi. Fractions - Answer Express numbers which are part of a whole Numerator - Answer Number written before the slash or above the fraction bar Proper fraction - Answer Numerator is less than denominator and the value of the fraction is less than one Improper fraction - Answer Numerator is greater than denominator and therefore is greater than one except with negative fractions Mixed numbers - Answer A whole number and proper fraction. A negative sign in front applies to both parts of the mixed number. Multiples - Answer Integers created by multiplying one number times another number Fractions - Answer Express numbers which are part of a whole Numerator - Answer Number written before the slash or above the fraction bar Proper fraction - Answer Numerator is less than denominator and the value of the fraction is less than one Improper fraction - Answer Numerator is greater than denominator and therefore is greater than one except with negative fractions Mixed numbers - Answer A whole number and proper fraction. A negative sign in front applies to both parts of the mixed number. Multiples - Answer Integers created by multiplying one number times another number Reciprocal - Answer The number which of multiplied by divisor gives you one (like the fraction flipped over) Terminal decimal - Answer Has digits that end Ratio - Answer Comparison of two numbers Rate - Answer A ratio that compares two quantities having different units of measure Proportion - Answer True statement in which two ratios are equal to each other. Two days are proportional of they are equivalent. Conditional proportion - Answer One part of a proportion is a variable or unknown quantity Celsius to Fahrenheit - Answer Celsius x 9/5 + 32 Fahrenheit to Celsius - Answer (Fahrenheit - 32) x 5/9 Constant - Answer Number with a fixed value. All real numbers are constants Elementary operations - Answer Addition, subtraction, multiplication, division Base - Answer The number an exponent is written next to Variable - Answer Symbol that represents our holds the place of a numerical value Coefficient - Answer A number by which a variable is being multiplied. Coefficients are written in front of variables. 16x, 16 is coefficient. If there is no number you assume an invisible1. Term - Answer Can be a single constant, a single, or a number of constants and variables multiplied together. Algebraic expression - Answer String of terms connected by division, addition, and subtraction. How to write an algebraic expression - Answer Constants at end. Write terms with the largest exponents first. Always write in descending order of exponent value with constants at the end. Inverse operation - Answer Operations that undo each other. Subtraction is inverse of addition. Division is inverse of multiplication. Like terms - Answer Have the same variable with the same exponent Degree of an expression - Answer Refers to largest exponent in an expression Linear - Answer Has degree of 1 Quadratic - Answer Has degree of 2 Cubic - Answer Has degree of 3 Constant - Answer Has degree of 0 Distributive property - Answer Principle used to multiply a single term by multiple terms. If there are parenthesis around multiple terms which are in turn multiplied by a single term, we can use this property.