In statistics, alpha represents the value that checks the test statistic in order to determine if it is significant or not. In other words, alpha is the acceptable margin of type 1 error. Alpha is also called the significance level, which opposes the confidence level. Significance level + confidence level = 1.
Distribute on the left side 7.4a+22.2=3.2a+43.2 Subtract 3.2a from both sides 4.2a+22.2=43.2 Subtract 22.2 from both sides 4.2a=21 Divide both sides by 4.2 a=5
