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 overbarx equals=25,
n equals=38,
sigma σ equals=4
confidence
level equals=95%
Click here to view page 1 of the standard normal distribution table.
LOADING...
Click here to view page 2 of the standard normal distribution table.
LOADING...
. 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
_______.
Homework Answers
The z-value for 95% confidence interval is 1.96
Sample mean = 25
Standard deviation = 4
Standard error of mean = σ / √ n
Standard error of mean = 4 / √ 38 = 0.65
95 % confidence interval = 25-(0.65)*(1.96) and 25+(0.65)*(1.96)
=(23.73, 26.27)
The confidence interval is from 23.73 to 26.27
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A sample mean, sample size, population standard deviation,
and confidence level are provided. Use this information...
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