Stat 4

Important Terms Population Total set of pendants in which we are interested Histogram Interpretation How many another(prenominal) total students sampled? 60 + 82 + 60 + 41 = 243 Which kinsperson has highest / lowest relative frequency? What are those frequencies? Highest: 100-109 with 82 Lowest: 120-129 with 41 How many students maintain an IQ surrounded by 110 and 129? 60 + 41 = 101 Sample A subset of the population for which we have stochasticity Subject Entities we measure (individuals) Stem-And-Leaf Plot A bar graph on its side Stem is any digits except the run low one Last digit is the flip over rising order No commas If nothing in a row, save up the row, but leave it blank Example (HW 2.1-2.2) eBay selling termss 199 210 210 223 225 225 225 228 232 235 attempt out Methods Simple Random Sampling Each subject everywhere has an every bit likely chance of creation selected Often done with a random number card Choosing a com pany someplace in the U.S. Systematic Selecting every k-th subject Surveying every tenth person we gain downtown Convenience Individuals are easily found (e.g.

acquire surveys) Often the laziest way, so less reliable answers Sampling Methods Strati?ed Sampling winning some subjects from all potential groups lopsidedness Cluster Sampling Taking all subjects from some possible groups Outliers The pie-eyed is sensitive to outliers. The median(prenominal) is resistant to outliers. When outliers are present, best to intent median as measure of central tendency. Example: mean(a) selling price of homes in the U.S. Standard Deviation (Quiz Que! stion) The fair distance between any data point and the mean of the data. Measures how much/ minute the data distribution is spread out. digest Stats Interpretation Mean Average of the data set Box-Plot (HW 2.5-2.6) normal (also called Q2) About 50% of data lie downstairs (and above) this value. flow Difference between maximum and minimum ...If you want to frig around a full essay, order it on our website: BestEssayCheap.com

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