STA 2023: Lecture 3 Summary Statistics Exam Questions And Answers ( Verified And Updated )

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 number of observations) median - answerthe midpoint of a distribution, the number such that half of the observations are smaller and the other half are larger - to find; arrange all observations from smallest to largest if n is odd then the media is the center of the ordered list if the n is even the median is the average of the 2 center observations in the ordered list mean vs. median - answer-if the distribution is exactly symmetric, the mean and median are exactly the same -in a skewed distribution, the mean is usually farther out in the long tail than is the median When qualitative, the first thing you do is - answergraph! (histograms and stemplots) what are the 2 teams? - answer1) mean and distribution 2) median and IQR mean symbol sample - answer mean symbol population - answer median symbols - answerpopulation: M