The mean of the sampling distribution of the sample means is the mean of the population from which the scores were sampled:
ΞΌxΛβ=ΞΌ==59+5+6+12+15β=9.4.
Population variance:
Ο2=β(xiββΞΌ)2β
P(xiβ),
XβΞΌ=={9β9.4,5β9.4,6β9.4,12β9.4,15β9.4β}=
={β0.4,β4.4,β3.4,2.6,5.6β},
Ο2=(β0.4)2β
51β+(β4.4)2β
51β+(β3.4)2β
51β++2.62β
51β+5.62β
51β=13.84.
Variance of the sampling distribution of sample means:
ΟxΛ2β=nΟ2β=213.84β=6.92.
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