Suppose a company has hourly readings from 800 sensors for a whole year that are used to monitor theworkings of a large system of industrial equipment. Given some labeled anomalies, an engineer wants to build a classifier to predict anomalies from future readings of these sensors. She trains a machinelearning model and uses 10-fold cross-validation to tune hyper-parameters (using vanilla methods from scikit-learn, for example). When new data comes in, however, the accuracy of the classifier is poor. She is confused as the cross-validation error was quite good. What might explain these results?

Recently, verizon wireless ran a pricing trial in order to estimate the elasticity of demand for its services. the manager selected three states that were representative of its entire service area and increased prices by 5 percent to customers in those areas. one week later, the number of customers enrolled in verizon's cellular plans declined 4 percent in those states, while enrollments in states where prices were not increased remained flat. the manager used this information to estimate the own-price elasticity of demand and, based on her findings, immediately increased prices in all market areas by 5 percent in an attempt to boost the company's 2016 annual revenues. one year later, the manager was perplexed because verizon's 2016 annual revenues were 10 percent lower than those in 2015"the price increase apparently led to a reduction in the company's revenues. did the manager make an error? yes - the one-week measures show demand is inelastic, so a price increase will decrease revenues. yes - the one-week measures show demand is elastic, so a price increase will reduce revenues. yes - cell phone elasticity is likely much larger in the long-run than the short-run. no - the cell phone market must have changed between 2011 and 2012 for this price increase to lower revenues.

Monica needs to assess the slide sequence and make quick changes to it. which view should she use in her presentation program? a. outline b. slide show c. slide sorter d. notes page e. handout

Josie just bought her first fish tank a 36 -gallon glass aquarium, which she’s been saving up for almost a year to buy. for josie, the fish tank is most likely what type of purchase