What are some good brain teasers?

What are some good brain teasers? Answers Answer 1 – “The” is repeated. Answer 2 – Throw the ball up in the air. Answer 3 – The letter “M”. Answer 4 – A s...

Can correlation ever be 1?

Can correlation ever be 1? Correlation coefficient cannot be greater than 1. As a matter of fact, it cannot also be less than -1. Does a correlation of 1 ...