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confidence interval interpretation one sample
We are __% confident that the interval from A to B captures the true "context."
confidence level interpretation
If we take many, many samples and calculate a confidence interval for each, about ___% of them will capture the true "context."
as confidence level C decreases what happens to margin of error
gets smaller
as sample size decreases what happens to the margin of error
increases
relationship between sample size and confidence interval width
As sample size increases, confidence interval width decreases
As sample size decreases, confidence interval width increases
population
everyone in the category
parameter
number that describes the population
sample
portion of population
statistic
number describing the samplae
criteria for constructing confidence interval
must be random
10% condition
large counts condition
equation to create confidence interval
standard error equation
how to find sample size
what does it mean if a two proportion confidence interval contains 0
it is plausible that there is no difference between the two
“are the two population proportions equal?”
determine if they are both positive or negative, if both positive and negative then no
if both positive, then the positive value in the subtracting is better
if both negative, then the negative value in the subtracting is better
criteria for 2 proportion of z interval
random for both
10% for both
large counts for both
interpretation of 2 proportion confidence interval
we are ___% confident that the interval from ___ to ___ contains the true population proportion of ________ (p1-p2)
if conditions are met how to create the 2 proportion z interval
