Statistics Study guides, Revision notes & Summaries

Positive correlation As one variable increases, the other variable increases Negative correlation As one variable increases, the other decreases A point on the scatter plot represents how many values? 2 (X and Y) Relationship between linear and scatter plot diagrams? The regression line is the bestfitting line through a scatter plot If you see the notation (E X)(E Y) what should you do? First sum the Xs, then sum the Ys, then multiply the sums If you see the notation E XY what should you...

Statistics Exam Questions With 100% Correct Answers 35 - answerWhat is the IQR (Q3-Q1) for this data set: 52, 72, 96, 21, 58, 40, 75? 40 - answerWhat is Q1 for this data set: 52, 72, 96, 21, 58, 40, 75? 75 - answerWhat is Q3 for this data set: 52, 72, 96, 21, 58, 40, 75? 58 - answerWhat is the median for this data set: 52, 72, 96, 21, 58, 40, 75? 4 - answerWhat is the IQR (Q3-Q1) for this data set: 20, 21, 18, 17, 20, 15, 56? 17 - answerWhat is Q1 for this data set: 20, 21, 18, 17, 20, 15...

Statistics Summary Ch 4 Exam With Complete Solutions Mean - answerThe arithmetic average of a data set. Most common measure of central location. To calculate the mean - answerAdd up all the values in the data set and then divide by the number of observations. Notation - answerseries or system of written symbols used to represent numbers, amounts, or elements in something such as music or mathematics. Numerical summaries of shape are - answernot covered because they are seldom used in pr...

Intro to Summary Statistics Exam With Complete Solutions summary statistics - answercollection, evaluation, and interpretation of data, statistical analysis of measurements can verify the quality of a design process central tendency - answermean, median, mode Variation - answerspread of values around the center range, standard deviation, IOR - answerexamples of variation distribution - answersummary of the frequency of values frequency tables, histograms, normal distribution - answerexam...

Summary statistics Exam Questions With 100% Correct Answers Summary statistics - answer- The first thing you want to do in Data analysis - describe data sets or relationships between variables with one or a few numbers: - What is the central value? - How widely are values spread from the center? - Are there data that are very atypical? - Are variables related? Why central tendency? - answer- You can't report the 1000 values to your boss! - Describe a whole set of data with a single val...

STA2023: Summary Statistics Exam Questions And Answers ( Verified And Updated ) A number that arises from a set or sample of data is a what? - answerStatistic R = range = ? - answermax - min IQR = Interquartile Range = ? - answerQ3 - Q1 Lower Fence = ? - answerQ1 - (1.5 * IQR) Upper Fence = ? - answerQ3 + (1.5 * IQR) x-bar = ? - answerAverage/mean Σx = ? - answerTotal value Σx^2 = ? - answerTotal squares Sx = ? - answerSample standard deviation σx = ? - answerPopulation standard d...

STA 2023: Lecture 3 Summary Statistics Exam Questions And Answers ( Verified And Updated ) objectives of summary statistics - answer-measuring center: mean and median -measuring spread: Quartiles -measuring spread: standard deviation -choosing measures of center and spread mean (arithmetic average) - answerthe most common measure of center -to find, add the values and divide by the number of observations -cannot resist the influence of extreme observations (add values and divide by the...

Summary Statistics Exam Questions And Answers ( Verified And Updated ) Standard Deviation - answerThe average distance that each value in a data set is away from the mean Variance - answerAverage squared deviations from the mean Range - answerThe difference between the maximum value and the minimum value of a data set What does a low standard deviation indicate about a data set as opposed to a high standard deviation? - answerA low standard deviation indicates the values in a data set te...

Summary Statistics ch 4 Exam Questions And Answers ( Verified And Updated ) What are three main measures of central location? - answer1) Mean 2) Median 3) Mode What is a mean? - answerthe gravitational center of the distribution What is a mode? - answerthe most frequently occurring value in the data ==> usually only used in large data sets with many repeating values What is the median? - answerthe central value in the order array of the data Describe the notation for: 1) sample size...