A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 19.4, and the sample standard deviation, s, is found to be 4.3. (a) Construct a 95% confidence interval about μ if the sample size, n, is 31. (b) Construct a 95% confidence interval about μ if the sample size, n, is 63. How does increasing the sample size affect the margin of error, E? (c) Construct a 98% confidence interval about μ if the sample size, n, is 31. How does increasing the level of confidence affect the size of the margin of error, E?
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 19.4, and the sample standard deviation, s, is found to be 4.3. (a) Construct a 95% confidence interval about μ if the sample size, n, is 31. (b) Construct a 95% confidence interval about μ if the sample size, n, is 63. How does increasing the sample size affect the margin of error, E? (c) Construct a 98% confidence interval about μ if the sample size, n, is 31. How does increasing the level of confidence affect the size of the margin of error, E?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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Question
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean,
x,
is found to be
19.4,
and the sample standard deviation, s, is found to be
4.3.
(a) Construct a
95%
confidence interval about
μ
if the sample size, n, is
31.
(b) Construct a
sample size affect the margin of error, E?
95%
confidence interval about
μ
if the sample size, n, is
63.
How does increasing the (c) Construct a 98% confidence interval about μ if the sample size, n, is 31.
How does increasing the level of confidence affect the size of the margin of error, E?
How does increasing the level of confidence affect the size of the margin of error, E?
(d) If the sample size is 21, what conditions must be satisfied to compute the confidence interval?
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