Let X be the temperature in °C at which a certain chemical reaction takes place, and let Y be the temperature in °F (so Y = 1.8X + 32). (a) If the median of the X distribution is p, show that 1.8 + 32 is the median of the Y distribution. P(Y s 1.8ũ + 32) = PY S 1.8 + 32 = P X Since i is the median of X, P(X s p) = 0.5 0.5. Thus, 1.8 + 32 is the median of Y. (b) How is the 9oth percentile of the Y distribution related to the 90th percentile of the X distribution? n,(.9) = ( 1.8 + Verify your conjecture. P(Y s 1.8n(.9) + 32) = P 1 S 1.8n 1.9) + 32 (16% 5 Since n1.9) is the 90th percentile of X, P(X s n.9)) = 0.9 X . Thus, 1.87 4.9) + 32 is the 90th percentile of Y. (c) More generally, if Y = ax + b, how is any particular percentile of the Y distribution related to the rresponding percentile of the X distribution? ndo) - ( 32 1.8 This is a result of the following. P(Y s an Ap) + b) P Y s anlp) + b) = P Since n (p) is the (100p)th percentile of X, P(X s n (p)) = p. Thus, an (p) + b is the (100p)th percentile of Y.

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Let X be the temperature in °C at which a certain chemical reaction takes place, and let Y be the temperature in °F (so Y = 1.8X + 32).
(a) If the median of the X distribution is p, show that 1.8 + 32 is the median of the Y distribution.
P(Y s 1.8ũ + 32)
= P
Y
< 1.8 + 32
= P
Since i is the median of X, P(X sP) =
0.5
0.5. Thus, 1.8ũ + 32 is the median of Y.
(b) How is the 90th percentile of the Y distribution related to the 90th percentile of the X distribution?
ny(.9) = ( 1.8
n,(.9) + ( 32
Verify your conjecture.
P(Y s 1.87(.9) + 32)
<1.87 .9) + 32
= Pl
X
<ny(.9)
= P
Since n1.9) is the 90th percentile of X, P(X s n1.9)) = 0.9
. Thus, 1.8n 1.9) + 32 is the 90th percentile of Y.
(c) More generally, if Y = ax + b, how is any particular percentile of the Y distribution related to the corresponding percentile of the X distribution?
nAe) = (| 1.8
ndo) - (32
This is a result of the following.
P(Y s an Ap) + b) = P( Y
s anx(p) +
= P X
Since n (p) is the (100p)th percentile of X, P(X sn 0)) = p. Thus, an (p) + b is the (100p)th percentile of Y.
Transcribed Image Text:Let X be the temperature in °C at which a certain chemical reaction takes place, and let Y be the temperature in °F (so Y = 1.8X + 32). (a) If the median of the X distribution is p, show that 1.8 + 32 is the median of the Y distribution. P(Y s 1.8ũ + 32) = P Y < 1.8 + 32 = P Since i is the median of X, P(X sP) = 0.5 0.5. Thus, 1.8ũ + 32 is the median of Y. (b) How is the 90th percentile of the Y distribution related to the 90th percentile of the X distribution? ny(.9) = ( 1.8 n,(.9) + ( 32 Verify your conjecture. P(Y s 1.87(.9) + 32) <1.87 .9) + 32 = Pl X <ny(.9) = P Since n1.9) is the 90th percentile of X, P(X s n1.9)) = 0.9 . Thus, 1.8n 1.9) + 32 is the 90th percentile of Y. (c) More generally, if Y = ax + b, how is any particular percentile of the Y distribution related to the corresponding percentile of the X distribution? nAe) = (| 1.8 ndo) - (32 This is a result of the following. P(Y s an Ap) + b) = P( Y s anx(p) + = P X Since n (p) is the (100p)th percentile of X, P(X sn 0)) = p. Thus, an (p) + b is the (100p)th percentile of Y.
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