Facebook retrace under 200ema

I came up with this theory with Apple and back tested it with Facebook to see if it would come to an are of significance again like it did with Apple. If you take the average price drop between the last 2 major corrections, 2018/1029 and the beginning of coronavirus pandemic, you get about 90.64. If you subtract that from Facebook's top at about 250.1 you get 159.77. During the first correction, Facebook dropped to about 120, right under the 200ema. Then during the second correction, Facebook dropped to about 140, again right under the 200ema with about a $20 price difference from the first correction. A 160 correction would put us a $20 price difference between the last correction and also right under the 200ema