Suppose z is the standard normal random variable. Use Excel to calculate the following:
a. P(z ? 2.5)
b. P(0 ? z ? 2.5)
c. P(–2 ? z ? 2)
d. P(z ? –0.38)
e. P(z ? 1.62)
f. z value with 0.05 in the lower tail
g. z value with 0.05 in the upper tail
a. P(z ? 2.5) =NORM.S.DIST(2.5,TRUE)
b. P(0 ? z ? 2.5) =NORM.S.DIST(2.5,TRUE)-NORM.S.DIST(0,TRUE)
c. P(–2 ? z ? 2) =NORM.S.DIST(2,TRUE)-NORM.S.DIST(-2,TRUE)
d. P(z ? –0.38) =NORM.S.DIST(-0.38,TRUE)
e. P(z ? 1.62) =1-NORM.S.DIST(1.62,TRUE)
f. z value with 0.05 in the lower tail =NORM.S.INV(0.05)
g. z value with 0.05 in the upper tail =NORM.S.INV(0.95)
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