chapter 22: inference about a population proportion Flashcards
1
Q
p̂
A
tests and confidence intervals for a population proportion p when the data are an SRS of size n.
note: a “success” is when an observation has the desired outcome
2
Q
the mean and standard deviation of the sample when finding p
A
the mean is p
the standard deviation is found with this formula
3
Q
for large n, p̂ has approximately the distribution
A
4
Q
the confidence interval for p is
A
5
Q
The margin of error in the large-sample confidence interval for p is
A
6
Q
p*
A
when we have to guess the proportion of successes
7
Q
how to find the sample size for a desired margin of error
A
where p* is a guessed value for the sample proportion. The margin of error will always be less than or equal to m if you take the guess p* to be 0.5.
8
Q
To test the hypothesis H0: p=p0
A
compute the z-statistic
