Solution,
Using t table,
a) degrees of freedom = 20
P(Z 1.68)
= 1 - P( Z 1.68)
= 1 - 0.946
= 0.054
b) degrees of freedom = 28
P( -c < t < c) = 0.90
= P(t < c) - P(t <-c ) = 0.90
= 2P(t < c) - 1 = 0.90
= 2P(t < c) = 1 + 0.90
= P(t < c) = 1.90 / 2
= P(t < c) = 0.95
= P(t < 1.701) = 0.95
= c ± 1.701
distribution Use the calculator provided to solve the following problems. • Consider a distribution with 20...
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