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8.1 large, independent samples
8.7 z=1.16, fail to reject H0
(1) all Indian hospital patients admitted in January,
(2) all Indian hospital patients admitted in May
c. z=1.27, fail to reject H0
8.15 no, z=1.70
8.17 z=8.34, reject H0
8.19 yes; z=2.13, reject H0 at α=.05
8.21 .48±.144 ; proportion greater for those who slept
8.23 Theory 1: z=2.79, reject H0, support theory; Theory 2: z=−.30, fail to reject H0, support theory
impractical to obtain such a large sample
difference almost meaningless
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