Chapter 8 AP Statistics Flashcards

5958618130	point estimator	a statistic that provides an estimate of a population parameter	0
5958624345	point estimate	the value of a statistic from a sample	1
5958633287	C% confidence interval	gives an interval of plausible values for a parameter point estimate +/- margin of error	2
5958642361	margin of error	shows how close we believe our guess is, based on the variability of the estimate in repeated SRSs of the same size critical value x standard deviation of statistic	3
5958664356	confidence level C	In C% of all possible samples, the method would yield an interval that captures the true parameter value.	4
5958677238	interpretation of confidence interval	We are C% confidence that the interval from ___ to ___ captures the true population [parameter in context].	5
5958694769	conditions for estimating population parameters	SRS, Independent, Normal	6
5958701088	standard error	when the standard deviation of the statistic is estimated from data	7
5958707491	The four step process	State, Plan, Do, Conclude	8
5958712689	degrees of freedom	for a t-distribution, this is required in order to find the critical value n-1	9
5958718854	z*	critical value for proportions	10
5958723460	t*	critical value for means, population standard deviation unknown	11
5958746415	Normal condition for means	CLT, n>= 30 if n<30, then no skewness or outliers if graphed	12
5958753902	Normal condition for proportions	np>10, n(1-p)>10	13
5958758725	Independent condition	sample size is less than 10% of the population	14
5958761673	random condition (SRS)	the sample must come from a well-designed random sample or randomized experiment	15