Stat 4

Important Terms Population Total set of subject matters in which we are interested Histogram Interpretation How many another(prenominal) total students sampled? 60 + 82 + 60 + 41 = 243 Which kinsperson has highest / lowest frequency? What are those frequencies? Highest: 100-109 with 82 Lowest: 120-129 with 41 How many students urinate an IQ surrounded by 110 and 129? 60 + 41 = 101 Sample A subset of the population for which we have entropy Subject Entities we measure (individuals) Stem-And-Leaf Plot A bar map on its side Stem is any digits except the utmost one Last digit is the flip over wage increase order No commas If nothing in a row, economise 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 shew out Methods Simple Random Sampling Each subject eachwhere has an every bit likely chance of world selected Often done with a random number control panel Choosing a co mpany someplace in the U.S. Systematic Selecting every k-th subject Surveying every tenth person we jibe downtown Convenience Individuals are easily found (e.g.

single-valued functionfulness surveys) Often the laziest way, so less reliable answers Sampling Methods Strati?ed Sampling winning some subjects from all likely groups skewness Cluster Sampling Taking all subjects from some possible groups Outliers The conceive is sensitive to outliers. The median(prenominal) is resistant to outliers. When outliers are present, best to use median as measure of central tendency. E xample: modal(a) selling price of homes in ! the U.S. Standard Deviation (Quiz Question) The medium distance between any data point and the mean of the data. Measures how much/ minute the data distribution is spread out. thickset Stats Interpretation Mean Average of the data set Box-Plot (HW 2.5-2.6) medial (also called Q2) About 50% of data lie downstairs (and above) this value. frame Difference between maximum and minimum ...If you want to build up a full essay, order it on our website: BestEssayCheap.com

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