Chapter 12
12.1
(a) 2.015.
(b) 2.518.
12.2
(a) 2.145.
(b) 0.688.
12.3
(a) 14. (b) 1.82 is between 1.761
(
0.05
p
)
=
and 2.145
(
0.025
p
)
=
.
(c) The
P
-value is
between 0.025 and 0.05. (In fact, the
P
-value is 0.0451.)
(d)
1.82
t
=
is significant at
0.05
α
=
but
t at
no
0.01
α
=
)
.
12.4
(a) 24. (b) 1.12 is between 1.059
(
0.15
p
=
and 1.318
(
0.10)
p
=
. (c) The
P
-value is
between 0.30 and 0.20.
(In fact, the
P
-value is 0.2738.)
(d) No,
1.12
t
=
is not significant at
either
0.10
α
=
or at
0.05
α
=
.
.
262
Chapter 12