Flashcards
Chapter 8
Cards in this deck (16)
- 1Interval EstimatePoint Estimate +/- Margin of Error
- 2What is purpose of interval estimate?Provide info on how close point estimator is to the value of the parameter
- 3Interval Estimat of Population MeanPopulation Mean +/- Margin of Error
- 4Population Standard DeviationAlso referred to as "known" case
- 5How to Compute Margin of ErrorNeed Population Standard Deviation OR sample standard deviations (s)
- 6Confidence Levelhow certain the intervals will contain the population mean
- 7How do you obtain a higher confidence level?margin of error and the width of confidence interval must be larger
- 830 is an adequate sample size: True or FalseTrue, but larger is always better!
- 9Population Mean UnknownMust use sample standard deviation (s) to estimate the population mean
- 10T DistributionFamily of similar probability distributions
- 11Degrees of FreedomNumber of independent pieces of information that go into computing s
- 12What happens when degree of freedom increases?difference
between the t distribution and the standard
normal probability distribution becomes smaller
and smaller - 131-AA = confidence level
Ex: 95 percent
1-0.95 = 0.05 - 14n-1Degrees of freedom, n is the total number of pieces your sample
- 15When reporting margin of error you need to always show both the upper end and lower end: True/FalseTrue
- 16Interval of Population ProportionPopulation proportion +/- Margin of Error
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- Flashcards on Chapter 8, created by Ashley Shah on 09/10/2016.
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- Ashley Shah
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