Exhibit 16.5 A researcher wished to estimate the proportion of all families who go to the movies at least once a month.He wished the estimate to be accurate within plus or minus 4 percentage points and further desired a 95 percent confidence interval (z = 2)around the result.Additionally,he estimates the population proportion as 0.30.
Refer to Exhibit 16.5.After the households were surveyed,the sample proportion of households using liquid soap was determined to be 0.2.The precision at the 95% confidence level is + or -
A)0.028 percentage points.
B)0.032 percentage points.
C)0.040 percentage points.
D)0.057 percentage points.
E)0.141 percentage points.

Question

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The Answer of Exhibit 16.5 A researcher wished to estimate the proportion of all families who go to the movies at least once a month.He wished the estimate to be accurate within plus or minus 4 percentage points and further desired a 95 percent confidence interval (z = 2)around the result.Additionally,he estimates the population proportion as 0.30.
Refer to Exhibit 16.5.After the households were surveyed,the sample proportion of households using liquid soap was determined to be 0.2.The precision at the 95% confidence level is + or -
A)0.028 percentage points.
B)0.032 percentage points.
C)0.040 percentage points.
D)0.057 percentage points.
E)0.141 percentage points.