Question
In: Statistics and Probability
Determine the minimum sample size required when you want to be 90% confident that the sample...
Determine the minimum sample size required when you want to be 90% confident that the sample mean is within one unit of the population mean and sigma=10.8. Assume the population is normally distributed.
You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals.
From a random sample of 45 business days, the mean closing price of a certain stock was $116.70. Assume the population standard deviation is $11.02. The 90% confidence interval is
Construct the indicated confidence interval for the population mean using the t-distribution. Assume the population is normally distributed.
c=0.99 x =14.2, s= 0.73 , n=14
Solutions
Expert Solution
Given:
Standard deviation, 
= 10.8
Margin of error = E = 1
Level of significance , 
= 1-0.90 = 0.1
Therefore 99% Confidence interval for population
mean ( 
) is ( 13.6124,
14.7876)
orchestra answered 11 months agoRelated Solutions
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Group of answer choices
The 90% confidence interval for the population mean when a random sample of size 16 was...
The 90% confidence interval for the population mean when a
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its mean was calculated to be 22 and its standard deviation was
calculated to be 3. (The population had a normal
distribution with an unknown standard
deviation.) No concluding statement is
required.
a) The 90% confidence interval for the population mean when a random sample of size 16...
a) The 90% confidence interval for the population mean when a
random sample of size 16 was taken from a very large population and
its mean was calculated to be 22 and its standard deviation was
calculated to be 3. (The population had a normal distribution with
an unknown standard deviation.) No concluding statement is
required.
b) Determine the p-value for testing: H0: µ = 15 Ha: µ > 15
when a random sample of size 18 was taken from...
The 90% confidence interval for the population mean when a random sample of size 16 was...
The 90% confidence interval for the population mean when a
random sample of size 16 was taken from a very large population and
its mean was calculated to be 22 and its standard deviation was
calculated to be 3. (The population had a normal distribution with
an unknown standard deviation.) No concluding statement
is required.
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