AMS 5 Study Guide - Quiz Guide: Homoscedasticity, Current Population Survey (Us), Luxury Vehicle

• School: UCSC
• Department: Applied Math and Statistics
• Course: AMS 5
• Professor: All

Document Summary

Summer session i, 2017: (a) (3 pts) a certain set of numerical data has average x = 30 and standard deviation sdx = 4. If 30 xj 38, then 0 zj = (xj 30)/4 2. If xj 26, then zj = (xj 30)/4 1 so as above, the percentage of the data that lies below 26 is approximately equal to the area under the normal curve below 1. The area under the normal curve between 1 and 1 is about 68%, so the area between 1 and 0 is about 34% (half of 68%). Answer yes or no and explain your choice brie y. No, this data does not have an approximately normal distribution. The smallest value in the data is 0. 8 = 4/5 standard deviations below average, which means that 0% of the data lies more than 1 standard deviation below average.