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1 - POLS 306 Final

Terms in this set (10)

What happens to the confidence interval for the mean as Z increases?
The interval gets wider.
When is t = Z?
n = 150
When do we use n-1 in the estimation of the standard error for the mean?
When the sample standard deviation has been calculated using n.
A __________ is a range of values which the true mean of the population is believed to be located.
confidence interval for the mean
How do you calculate the degrees of freedom for t?
n -1
What is the relationship between the standard error of the mean and the standard deviation of the sample?
The former is equal to the latter divided by square root of n.
What happens to the confidence interval for the mean when the standard deviation decreases?
The interval gets narrower.
What happens to the confidence interval for the mean when the sample size increases?
The interval gets narrower.
What is the Z value associated with 95% of the standard normal curve?
1.96
Who developed the t-distribution?
William Gosset
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