Category «Flashcards»

test 2 stats class

Question Answer Measure of Center Value at the senter or middle of a data set. Arithmetic mean/ Mean A set of data is the measure of center found by adding the data values and dividing the total by the number of data values Sample size Number of data values Median The measure of center that …

Introduction to Statistics and Data

Word Definition Statistics A way of reasoning using calculations made from data that help understand the world. Context Tells WHO was measured, WHAT was measured, WHERE the data was collected, WHEN and WHY the study was performed, and HOW the data were collected. Data Systematically recorded information with its context. Data Table An arrangement of …

Displaying and Describing Categorical Data

Word Definition Frequency Table Record totals and category names. Distribution of categorical variables. Pile Count number of data values in each category of interest. Relative Frequency Table Counts are expressed as percentages. Distribution of categorical variables. Area Principle Each data value should be represented by the same amount of area. Equal width and equal spacing. …

Displaying and Summarizing Quantitative Data

Word Definition Distribution Slices up all possible values of the variable into equal-width bins. Gives counts of values falling into each bin. Histogram Show distribution of a quantitative variable. Each bar represents frequency (counts) of values falling into each bin. Bars can touch. MUST HAVE FREQUENCY TABLE. Relative Frequency Histogram Each bar represents frequency of …

Understanding and Comparing Distributions

Word Definition Boxplot Displays Five Number Summary. Central box with whiskers that extend to the non-outlying data values. Useful for comparing groups and displaying outliers. Lower Fence (Outlier) Q1 – 1.5(IQR) Any datum below is lower outlier. Upper Fence (Outlier) Q3 + 1.5(IQR) Any datum below is upper outlier. Far Lower Outlier Any datum below …

Common Stat 151 Terms to know

Question Answer What is statistics a way of reasoning and a collecting of tools and methods that help us comprehend the world OR particular calculations made from data What is Data values (numbers, record names, labels) along with their context Who the individual cases about whom or which the data is from Respondents Individuals who …

Correlation and Regression

Question Answer Purpose of Correlation and Regression Make inferences based on sample data that come in pairs. Determine if there is a linear relationship b/w the two quantitative variables & describe it with an equation that can be used for predictions. Two dependent populations (quantitative data). Correlation Correlation coefficient measures the strength of the linear …

vocab

Question Answer model an equation or formula that simplifies and represents reality linear model a linear model is an equation of a line, need to know the variables along with their W's and their units predicted value the value of yhat for a given x-value in the data, a predicted value is found by substituting …

data analysis

Question Answer useful graphs scatterplot can get a sense for the nature of the relationship what to look for in a graph relationship between two variables where one variable causes changes to another location where most of the data lies spread variability of the data, how far apart or close together it is shape symetric, …

Chapter 4 Statistics

Question Answer What is a bivariate data? When values from two variables are collected from each individual in the population or sample, the set of data values are called bivariate data. (For example: height and weight collected from each GPC student) What is the response variable in a bivariate set of data? The response variable …