Retail stores, such as Target and Walmart, along with eCommerce sites, such as Amazon and eBay, rely heavily on the holiday shopping period of October, November, and December to drive their overall revenue. In recent years, these types of retailers have coupled big data with time series analytics to enhance marketing, supply chain, operations, and customer relations.

Using the Internet, identify an example of where a retail company has done this. The example could be positive or negative, but should clearly include evidence that the company used big data and time-series analytics in an effort to improve its revenue. If the example you find does not discuss the use of analytics, then it is not considered. The example selected must show that the company used analytics to magnify its business effectiveness through data and analytics activities. Provide a summary of the example you have chosen. Specifically, discuss the analytic techniques the company used and what they intended to accomplish through their data-driven activities. Report on the company's success in its endeavors. If there are negative aspects of their efforts, be sure to highlight those (examples might include errors in their analysis or forecasts, or backlash from consumers for some reason).

Assuming a Gaussian Mixture Model with K components, select all of the following statements which are true. O Each (unweighted) Gaussian component of the GMM integrates to 1/K O The full Gaussian Mixture Model integrates to 1 O The full Gaussian Mixture Model integrates to K O Each (unweighted) Gaussian component of the GMM integrates to 1QUESTION 22 When it comes to people's tastes, what do economists generally believe? a. Tastes are based on forces beyond the realm of economics. O b. Tastes don't change. C. Tastes are based on historical and psychological forces. O d. Tastes do not directly affect demand. QUESTION 23 If the average annual growth rate of a developing country is 7.2 percent, real GDP will double in O a. 10 years O b. 14.4 years O c. 2 years O d. 15 years O e. 7.2 years QUESTION 24Procter and Gambling are testing a new toothpaste. A sample of 400 individuals participated in the taste test and 80 indicated they like the taste. Conduct a hypothesis test to determine if at least 22% of the population will like the new toothpaste. At a 5% significance level, use the critical value approach to determine if you should reject the null hypothesis. What is the z-value and z-critical? Oz-value= 0.9656 and z-critical = 1.645 Oz-value= - 0.9656 and z-critical = 1.645 z-value= -0.9656 and z-critical = - 1.785 ONone z-value= -0.9656 and z-critical = 1.956Problem 2 Write a function gaussian that calculates the Gaussian pdf, f (x) = exp -? (* , " ) . When called with only x as an input argument, the function should return the pdf of the standard Gaussian distribution. In [ ]: # Write the function here YOUR CODE HERE raise Not ImplementedError ( ) In [ ] : from nose. tools import assert_equal assert_equal( gaussian(1, 1.2, 2), 0. 1984762737385059) assert_equal (gaussian(1), 0. 24197072451914337)