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USMLE Step 1 Web Prep — Descriptive Statistics 155705 >>> 00:00:00 SLIDE 1 of 13 Statistics Descriptive Statistics 155725 >>> 00:01:24 SLIDE 2 of 13 Descriptive Statistics Distributions - Central tendency Mean: average Median: midpoint, 50th percentile Mode: most frequent value In a normal distribution these are the same value 155730 >>> 00:03:50 SLIDE 3 of 13 Descriptive Statistics Distributions - Central tendency Mean: average Median: midpoint, 50th percentile Mode: most frequent value In a normal distribution these are the same value 155735 >>> 00:04:40 SLIDE 4 of 13 Descriptive Statistics Distributions - Central tendency Mean: average Median: midpoint, 50th percentile Mode: most frequent value In a normal distribution these are the same value 155765 >>> 00:08:16 SLIDE 5 of 13 Measures of Variability Range Standard deviation 155745 >>> 00:08:25 SLIDE 6 of 13 Measures of Variability Range Standard deviation 155750 >>> 00:11:18 SLIDE 7 of 13 Measures of Variability Range Standard deviation 155755 >>> 00:12:29.2 SLIDE 8 of 13 Measures of Variability Range Standard deviation 155760 >>> 00:13:23.2 SLIDE 9 of 13 Measures of Variability Range Standard deviation 155770 >>> 00:14:44 SLIDE 10 of 13 Measures of Variability Range Standard deviation 155775 >>> 00:18:04 SLIDE 11 of 13 Practice Questions 1. In a normal distribution curve, what percent of the cases are below 2SD below the mean? 2. In a normal distribution curve, what percent of the cases are above 1SD below the mean? 3. A student who scores at the 97.5 percentile falls where on the curve? 155780 >>> 00:19:59 SLIDE 12 of 13 Practice Questions A student took 2 tests. On which test did the student do better? Score Mean Standard Deviation Test A 45 30 5 Test B 60 40 10 155785 >>> 00:22:26 SLIDE 13 of 13