Statistics Study guides, Class notes & Summaries

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...

Summary Statistics Exam Questions And Answers ( Verified And Updated ) mean - answerThe arithmetic average of a data set is the: adding all values, dividing by the number of values - answerMean is calculated by: sample size - answerIn statistics, n designates: susceptibility to skew - answerA major failing of the mean in describing a data set is its: median - answerThe midpoint of a distribution is the: mode - answerThe most frequently occurring value in the data set is: unimodal - answe...

STA 296 Final Exam Question & Answers A - ANSWER: 210 first-year college students were randomly assigned roommates. For the 78 students assigned to roommates who brought a video game to college: average GPA after the first semester was 2.84, with a standard deviation of 0.669. For the 132 students assigned to roommates who did not bring a video game to college, average GPA after the first semester was 3.105, with a standard deviation of 0.625. We are interested in 90% confidence interval fo...

How do you check if there is outliers?calculate IQR; anything above Q3+1.5(IQR) or below Q1-1.5(IQR) is an outlier If a graph is skewed, should we calculate the median or the mean? Why?median; it is resistant to skews and outliers If a graph is roughly symmetrical, should we calculate the median or the mean? Why?mean; generally is more accurate if the data has no outliers What is in the five number summary?Minimum, Q1, Median, Q3, Maximum Relationship between variance and standard devia...

Explain the difference between a population and a sample.A population is the entire group that is being studied while a sample is a subset of the population that is being studied. A(n) _________ is a person or object that is a member of the population being studied.Individual ________ statistics consists of organizing and summarizing information collected, while ________ statistics uses methods that generalize results obtained from a sample to the population and measure the reliability...

Alicia would like to know if there is a difference in the average price between two brands of shoes. She selected and analyzed a random sample of 40 different types of Brand A shoes and 33 different types of Brand B shoes. Alicia observes that the boxplot of the sample of Brand A shoe prices shows two outliers. Alicia wants to construct a confidence interval to estimate the difference in population means. Is the sampling distribution of the difference in sample means approximately norm...

Positive correlationAs one variable increases, the other variable increases Negative correlationAs 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 do?F...