Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) In a set of 2n observations, half of them are equal to `alpha` and the remaining half are equal to `-alpha`. If the standard deviation of all the observations is 2, then `|alpha|` is equal to- - Sarthaks eConnect
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In a set of 2n observations, half of them are equal to `alpha` and the remaining half are equal to `-alpha`. If the standard deviation of all the observations is 2, then `|alpha|` is equal to-

A.

2

B.

`sqrt2`

C.

`2sqrt2`

D.

4