Stats. Ch 7-8
When a 99% confidence interval is calculated instead of a 95% confidence interval with n being the same, the margin of error will be...
Larger
An estimator is consistent if as the sample size decreases, the value of the estimator approaches the value of the parameter estimated.
False
The test value separates the critical region from the noncritical region.
False
When the population standard deviation is unknown and the sample size is less than 30, what table value should be used in computing a confidence interval for a mean?
t
A good estimator should be _____, ______, and ______.
unbiased; consistent; relatively efficient
If you wish to test the claim that the mean of the population is 100, the appropriate null hypothesis is...
µ = 100
The probability of a type II error is referred to as __
ϐ
For a specific confidence interval, the larger the sample size, the smaller the margin of error will be.
True
Interval estimates are preferred over point estimates since a confidence level can be specified.
True
No error is committed when the null hypothesis is rejected when it is false.
True
To determine the sample size needed to estimate a parameter, you must know the margin of error.
True
When you are conducting the t test, the population must be approximately normally distributed.
True
Rejecting the null hypothesis when it is true is called a _____ error.
Type I
When the value of α is increased, the probability of committing a type 1 error is...
increased
The maximum likely difference between the point estimator of a parameter and the actual value of the parameter is called ____ __ _____.
margin of error
The degrees of freedom for the t test are ___.
n-1
The statement "The average height of an adult male is 5 feet 10 inches" is an example of a ____ estimate.
point
To test the claim that the mean is greater than 87, you would use a ____-tailed test.
right
For the t test, one uses ___ instead of σ
s
A conjecture about a population parameter is called a ____ _____.
statistical hypothesis
The three confidence levels used most often are the __%, __%, and __%.
90; 95; 99
The best point estimate of the population mean is...
The sample mean
