Statistics Homework Solutions
#4465
Determining the sampling distribution of a proportion.
According to a well-known newspaper journal, 58.3% of the 222,900 households in a particular county get the Sunday edition of the local newspaper. Suppose that random samples of 200 households are selected.
In what proportion of the samples will between 55% and 60% of the households get the Sunday edition of the newspaper?
P(0.55 < Ps <0.60) = P(-0.95 < Z < 0.49) = 0.5168
0.49 in the Cumulative Standardized Normal Distribution Table (= 0.6879)
What are the specific steps involved in converting P(0.55 < Ps <0.60) to P(-0.95 < Z < 0.49)?
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