Online 30 #3 Flashcards
What is a confidence interval?
the probability that a pop. parameter will fall between a set of values for a certain proportion of time
-it’s center is still the the sample mean, but there’s room on either side for uncertainty (MoE)
What does a confidence interval tell you?
it tells how much of an amount in a population is true
Ex: if there’s a 95% confidence interval, then out of 100 samples, 95 contain the true pop. mean
Does that mean the other 5% would be excluded or false?***
Yes(?)
What is a z-score?
tells the distance between the mean of a distribution and a data point in standard deviations
What is T-distribution?
a continuous probability distribution that’s unimodal; it’s a useful way to represent sampling distributions
What is the margin of error?
like the confidence interval
-reflects the uncertainty that surrounds sample estimates of parameters like the mean or a proportion
A 95% confidence interval is associated with a z-score of…
1.96
A 68% confidence interval has a z score of?
0.47
