Chapter 8 Questions Mcgraw Hill
what is the confidence level if α=0.05
(1-α)=(1-.05)=95%
a 95% confidence interval for the population mean is constructed as 6 +_ 2 what is the probability of error, α?
0.05
AAA batteries are advertised to have a life of about 9 hours of use. With a certain level of confidence , it is advertised that the life is between 8-10 hours. if 9 hours is the point estimate, than the margin of error is
1 hour (the margin of error is half of the width of the confidence interval)
for a 95% confidence interval for the population mean, if the samples of size n are drawn repeatedly from a given population, then
5% of the sample means will fall outside of the corresponding confidence interval
each t distribution is identified by its
degrees of freedom
Suppose you are constructing a confidence interval for the population mean, For a given confidence level and sample size, the width of the interval is wider for a
larger standard deviation
In order to construct a confidence interval for μ , the sampling distribution of the estimator X (with a line above it) must follow or approximately follow an _________distribution
normal
Two main components of a confidence interval are
point estimate and margin of error
Confidence interval can be interpreted as
range of values used to estimate an unknown population parameter
suppose you are constructing a confidence interval for a population mean, For a given confidence level and standard deviation, the width of the interval is wider for a
smaller sample size
The greek letter_________denotes the level of significance
α (alpha)
suppose you are constructing a confidence interval for the population mean. for a given sample size and population standard deviation, how will the width of the interval change as the confidence level increases?
It gets larger