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Cards In This Set
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Point estimate
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Single statistic used to estimate a populatoin parameter
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What is the point estimate of the mean of a population
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Mean of a sample
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What is the point estimate of population propotion (pie)
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P, sample proportion
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What is the point estimate of a population standard deviation?
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Sample standard deviation
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Confidence interval measures
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How close the point estimate is to the population parameter
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Confidence interval
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A range of values constructed from sample data that the population parameter is likely to occur wihtin that range at a specified probability. the specified prob is called the level of confidence
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95% of the sample means are within what of what?
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1.96 standard deviations of the population mean
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The standard deviations discussed are called
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Sampling errors, because they are the standard deviation of sampling means.
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95% confidence intervals only leaves __% and that is devided into what?
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5% and is devided into half for each tail
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What does the t distribution handle?
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Unknown standard devation
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What is the shape of a t?
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Flatter then a noraml dis. more spread out
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Why is t dis like this?
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Because it has a larger standard deviation then the normal dis
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What kind of a distribution is a t?
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Continuous
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What is the shape of a t?
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Bell shaped and symmetrical
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What grouping is a t?
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Into families of t distributions
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