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Suppose that the proportion of young adults who read at least
one book per month is 0.15, and this proportion is the same in
Boston and New York. Suppose that sample sizes of 400 are randomly
drawn from each city. The standard deviation for the sampling
distribution of differences between the first sample proportion and
the second sample proportion (used to calculate the z score) is
_______.
0.0459
0.0435
0.0402
0.0335
0.0319
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