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Let Xn denote the mean of a random sample of size n from a distribution that has p.d.f. f( x) = e-x, 0 <>x <>oo, zero elsewhere.
(a) Show that the m.g.f. M( t; n) of Yn = Jr,( in - I ) is equal to [e'1.J,, - (t/ Jr,)e1IJnJ -n, t Jn.
(b) Find the limiting distribution of Yn as n -+ oo.
This exercise and the immediately preceding one are special instances of an important theorem that will be proved in the next section.
What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
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