WGU C955 applied probability and statistics, WGU C955, Probability and Statistics, WGU C955. Top Exam Questions and answers, rated A+

WGU C955 applied probability and statistics, WGU C955, Probability and Statistics, WGU C955. Top Exam Questions and answers, rated A+ Additive inverse - -Values that are equally far from 0 on the number line. Algebraic expression - -String of terms connected by division, addition, and subtraction. Base - -The number an exponent is written next to Blind experimental study - -When information of a study isn't revealed to the participants Box plot - -an image that has 5 number summary: min, Q1, median, Q3, max, Boxplot - -an image that has min, Q1, median, Q3, max Celsius to Fahrenheit - -Celsius x 9/5 + 32 Closed question - -A question with limited choices, e.g. multiple choice or yes/no. Easier to analyze statistically. Cluster sample - -Sample frame is divided into groups, we select a few groups, then selecting ALL of the members of those groups. Cluster sample - -Sample frame is divided into groups, we select a few groups, then selecting ALL of the members of those groups. Coefficient - -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. Commutative - -The order in which the numbers appear in the sum can be reversed Composite number - -Has at least one positive factor other than one and itself Conditional proportion - -One part of a proportion is a variable or unknown quantity Constant - -Has degree of 0 Constant - -Number with a fixed value. All real numbers are constants Continuous data - -Has values within a range, measured not counted, does not have gaps between data points (data is connected lines or curves). Control group - -randomly assign people or things to groups. One group receives a treatment and the other group does not. This is the group that does not receive treatment Convenience sample - -Participants are easy for researcher to access. Tends to increase bias. Convenience sample - -Participants are easy for researcher to access. Tends to increase bias. Correlation coefficient, r - -Between -1 and 1; measures how close the points are to the line and if the trend is uphill (positive) or downhill (negative). Cubic - -Has degree of 3 Degree of an expression - -Refers to largest exponent in an expression Discrete data - -Has distinct values, can be counted, had unconnected points (think dots) Distributive property - -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. Double Blind Study - -When information of study is hidden from the researcher and the participant. Elementary operations - -Addition, subtraction, multiplication, division Example of discrete data - -Days of the week Experimental study - -A study where you split subjects up randomly and impose a change on one group to study the effect; can prove causation Experimenter effect - -When the persons running an experiment affects its results by influencing the subjects inadvertently Explanatory variable - -In a study, what we think is the "cause" Expressions - -A group of symbols such as numbers and operators that has mathematical validity Extrapolation - -Making predictions *outside* of the range of your data. This is generally a bad idea. Extrapolation - -Making predictions *outside* of the range of your data. This is generally a bad idea. Factorization - -Process of breaking up a composite number into its prime factors Factors - -Integers that evenly divide the initial integer Fahrenheit to Celsius - -(Fahrenheit - 32) x 5/9 For independent events, P(A and B) = ? - -P(A)*P(B) For independent events, P(A|B) = ? - -P(A) [this is the right side of which probability formula?] For skewed data, use these for center and spread - -In this situation, we use median (for center) & IQR (for spread) Fractions - -Express numbers which are part of a whole Fractions - -Express numbers which are part of a whole fundamental theorem of arithmetic - -Any integer greater than one is either Prime or the product of Prime numbers Histogram - -A graphical representation -- bars, measuring the frequency within each interval Histogram - -A graphical representation -- bars, measuring the frequency within each interval How to write an algebraic expression - -Constants at end. Write terms with the largest exponents first. Always write in descending order of exponent value with constants at the end. Identity property - -Adding 0 to any number does not change the original number