Identify the symbols used for each of the​ following: (a) sample standard​ deviation; (b) population standard​ deviation; (c) sample​ variance; (d) population variance.
a. The symbol for sample standard deviation is _________ [tex](s, s^2, \sigma, \sigma^2)[/tex].
b. The symbol for population standard deviation is _________ [tex](s, s^2, \sigma, \sigma^2)[/tex].
c. The symbol for sample variance is __________ [tex](s, s^2, \sigma, \sigma^2)[/tex].
d. The symbol for population variance is ________ [tex](s, s^2, \sigma, \sigma^2)[/tex].

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