Statistics Questions Related to
Sampling
What differentiates a z test
statistic for a population from the z statistic for a sampling of means? Why
the difference?
Consider a normal population with
? = 43 and ? = 5.2. Calculate the z-score for an x ? of 46.5 from a sample of
size 16.
Find the critical value z a/2 that
corresponds to the given confidence level. 88%
za/2=_____
Assume that a random sample is
used to estimate a population p. Find the margin of error E that corresponds to
the given statistics and confidence level. N=550, x=220, 90% confidence.
The margin of error E=____
Calculate the margin of error
E=Za/2•?/?n
The confidence level is 99%, the
sample size is n=103, and ?=16
E=____
Salaries of 47 college graduates
who took a statistics course in college have a mean, x ? of $65,000. Assuming a
standard deviation ? of $16,817, construct a 99% confidence interval for
estimating the population mean µ.
$___< µ < $____
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