Chapter 6 & 7 Statistics
the levels of significance most commonly used by staticians are ____ and _____ levels
0.05 and 0.01
The purpose of constructing a confidence interval for the mean is to ____ the true value of the population mean, based upon the mean of a _____
estimate ; sample
if your calculated test statistic does no meed or exceed the critical value, you would ______ the null hypothesis
fail to reject
In an independent samples hypothesis test, the number of cases in each sample must be equal.
false
in the test for the difference of means, independent sample design, the number of cases must be equal
false
Whether constructing a confidence interval for a proportion or a mean, there are two ways to increase the precision of the estimate. You can _ sample size, or you can _ the level of confidence.
increases; decreases
there is a ___ relationship between the level of confidence and the level of precision of the estimate
inverse
the alpha level is also known as the level of
level of significance
A confidence interval for the mean is calculated by adding and subtracting a value to and from the sample
mean
a confidence interval for the mean is an interval within which you believe the ___ of the population is located
mean
in the matched samples design, the sampling distribution at the issue is the sampling distribution of
mean differences
when constructing a confidence interval for a proportion, the margin of error is actually a reflection or statement of the ___ of the interval
width
another name for the region of rejection is the
critical region
As the level of confidence increases, the precision of your estimate
decreases
When our calculated test statistic falls within the ____, we reject the ____
region of rejection of critical region, null hypothesis
Which type of hypothesis test involves comparing two samples that are linked on a case-by-case basis?
related samples t-test
standard deviation unknown, how do you estimate the standard error of the mean?
s divided by the square root of n
A confidence interval for the mean is calculated by adding and subtracting a value to and from the
sample mean
standard error of the mean
standard deviation divided by the square root of n
in the independent samples design, the sampling distribution at issue is the sampling distribution of ____
the differences between means
When constructing a confidence interval for the mean with σ known, the standard error is calculated by dividing ______ by the square root of the sample size.
the population standard deviation
In a related samples hypothesis test, the number of cases in each sample must be equal.
true
in a matched sample design the number of cases in each sample must be equal
true
The level of significance is the probability of making a ___ error
type 1
Rejecting a null hypothesis when it is true represents a ___ error
type 2
Failing to reject a null hypothesis when it is false represents a ___ error
type 3