AP Statistics (Chapter 8) Flashcards
Terms : Hide Images [1]
| 9391448953 | standard error | When a standard deviation of a statistic is estimated from data, it is called...? | 0 | |
| 9391448954 | one-sample z interval for a population proportion | What should you include in step three for labeling (in proportions)? | 1 | |
| 9391448955 | sampling variability (and NOTHING else!) | What sources of error are taken into account for the margin of error? | 2 | |
| 9391448956 | use 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 | |
| 9391448957 | Margin of Error | This is the formula for... |  | 4 |
| 9391448958 | xbar +- z*(σ/root(n)) | What is the formula to calculate the confidence interval for the population mean given the population's standard deviation? | 5 | |
| 9391448959 | z = (xbar - μ)/(σ/root(n)) | How to calculate the z score when the sampling distribution of xbar is close to normal? | 6 | |
| 9391448960 | a t distribution is wider in the tails | What is the difference between a t and z distribution? | 7 | |
| 9391448961 | standard error of sample mean | What does Sx/root(n) calculate? | 8 | |
| 9391448962 | just different critical values | How do you calculate the confidence interval with z and t? | 9 | |
| 9391448963 | when there are outliers | When can you never use t procedures? | 10 | |
| 9391448964 | 0 or 1 | Once the interval is set for a certain value, what is the probability of the true mean/probability being within that interval?l | 11 | |
| 9391448965 | C% of all possible samples of a given size from this population will result in an interval that captures the actual parameter | How to interpret a confidence level? | 12 | |
| 9391448966 | gets smaller | What happens to the ME when the SD decreases? | 13 | |
| 9391448967 | decrease the confidence | How does one decrease the critical value? | 14 | |
| 9391448968 | no, 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 | |
| 9391448969 | ALL FOUR STEPS (state, plan, do, and conclude) | What should you do if a problem says "construct and interpret"? | 16 | |
| 9391448970 | State 1 sample z/t inverval, and check random, normal, and independent | What should you include in step 2 (plan)? | 17 | |
| 9391448971 | define the variable (mu or p) in context and C% | What should you include in step 1 (state)? | 18 | |
| 9391448972 | formula, substitution, and answer. Also df for t-dist | What should you include in step 3 (do)? | 19 | |
| 9391448973 | Your interpretation of the conf. interval | What should you include in step 4 (conclude)? | 20 | |
| 9391448974 | We are (__)% confident that the interval from (___) to (__) contains the actual mean/proportion (___) | What is the concluding statement for a confidence interval? | 21 |