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AP Statistics (Chapter 8) Flashcards

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9391448953standard errorWhen a standard deviation of a statistic is estimated from data, it is called...?0
9391448954one-sample z interval for a population proportionWhat should you include in step three for labeling (in proportions)?1
9391448955sampling variability (and NOTHING else!)What sources of error are taken into account for the margin of error?2
9391448956use phat = .5 (creates largest MoE)What should you do when calculating the Margin of Error for a proportion when you do not know the standard deviation (and have no similar studies to compare to)?3
9391448957Margin of ErrorThis is the formula for...4
9391448958xbar +- z*(σ/root(n))What is the formula to calculate the confidence interval for the population mean given the population's standard deviation?5
9391448959z = (xbar - μ)/(σ/root(n))How to calculate the z score when the sampling distribution of xbar is close to normal?6
9391448960a t distribution is wider in the tailsWhat is the difference between a t and z distribution?7
9391448961standard error of sample meanWhat does Sx/root(n) calculate?8
9391448962just different critical valuesHow do you calculate the confidence interval with z and t?9
9391448963when there are outliersWhen can you never use t procedures?10
93914489640 or 1Once the interval is set for a certain value, what is the probability of the true mean/probability being within that interval?l11
9391448965C% of all possible samples of a given size from this population will result in an interval that captures the actual parameterHow to interpret a confidence level?12
9391448966gets smallerWhat happens to the ME when the SD decreases?13
9391448967decrease the confidenceHow does one decrease the critical value?14
9391448968no, it's just not wrong. We don't know the "correct" value, we are estimating what it could be.If a value presented is within the CI, is it correct?15
9391448969ALL FOUR STEPS (state, plan, do, and conclude)What should you do if a problem says "construct and interpret"?16
9391448970State 1 sample z/t inverval, and check random, normal, and independentWhat should you include in step 2 (plan)?17
9391448971define the variable (mu or p) in context and C%What should you include in step 1 (state)?18
9391448972formula, substitution, and answer. Also df for t-distWhat should you include in step 3 (do)?19
9391448973Your interpretation of the conf. intervalWhat should you include in step 4 (conclude)?20
9391448974We are (__)% confident that the interval from (___) to (__) contains the actual mean/proportion (___)What is the concluding statement for a confidence interval?21

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