Tesla, Inc. is an American electric vehicle and clean energy company based in Palo Alto, California. Tesla's current products include electric cars, battery energy storage from home to grid scale, solar panels and solar roof tiles, and related products and services. Nikola Corporation is an American company that has announced a number of concept zero-emissions vehicles since 2016 and has indicated plans to produce some of them in the future. The company is based in Phoenix, Arizona, where its research and development facility is located. 35.79 USD Tesla Inc 419.62 USD Nikola Corporation 0.00% 0.00% 3 months 6 months YTD 5 years Max 50.00% Mon, 14 Sept 0.00% -50.00% -100.00% Nov 27 Question: Nikola's stock began trading on June 4, 2020. As of Dec 17, 2020, Nikola stock price have made 0.1049% expected daily return with 5.884% standard deviation, while Tesla stock price have made 0.1853% expected daily return with 3.533% standard deviation. The correlation coefficient of those stock is -0.7718, which is extraordinarily opposite. Which stock would you suggest to invest? Why? Provide an investment strategy based on the statistics and portfolio investment theory