Question
A sample mean, sample size, population standard deviation, and confidence level are provided. Use this information...
A sample mean, sample size, population standard deviation, and confidence level are provided. Use this information to complete parts (a) through (c) below.
x =2323, n=3434, σ=55, confidence level=95%
a.
Use the one-mean z-interval procedure to find a confidence interval for the mean of the population from which the sample was drawn.
The confidence interval is from__ to__
b.Obtain the margin of error by taking half the length of the confidence interval.
What is the length of the confidence interval? ___
c.Obtain the margin of error by using the formula E=z α/2 • σ/ square root n
Identify the critical value.
z α/2=___
What is the margin of error obtained using the methods of parts (b) and (c)?
___
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