Mastering Mathematics Smartly
by Wee Wen Shih
A unique self-help website that provides comprehensive coverage of mathematics at A-level & beyond, written in a student-friendly style.
Normal variables
Let us compare between: (1) n independent observations of a normal variable X and (2) n times that of a normal variable X.
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(1) has n observations, whereas (2) has only one.
- (1) and (2) both have the same mean.
- (1) and (2) have different variances.
When you find probabilities associated with normal variables, you will need to decide which of the two to consider.
Try this!
