krishimotam
07.11.2019 •
Mathematics
Apoll asked the question, "what do you think is the most important problem facing this country today? " twenty-three percent of the respondents answered "crime and violence." the margin of sampling error was plus or minus 4 percentage points. following the convention that the margin of error is based on a 95% confidence interval, find a 95% confidence interval for the percentage of the population that would respond "crime and violence" to the question asked by the pollsters.
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Ответ:
X = 23%
s = 4%
CI = 95 % (z = 1.96)
let n as the number of samples
The intervals are
x + z (s/√n)
and
x - z (s/√n)
substitute the given values and if n is given, you can get the exact values
Ответ:
Its temperature is DECREASING.