Flashcard Set Preview
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| 1 |
random variability between observations or statistics that is simply due to chance
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sampling error
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| 2 |
what is "s"
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sample standard deviation
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| 3 |
what is "o"
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population standard deviation
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| 4 |
what are the two approach if n < 30
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1. when pop SD is known - use normal distribution and z-score2. when pop SD is not known -...
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| 5 |
why does sample size matter?
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t-distribution becomes closer and closer to the z-score (standard normal) distribution as sample...
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| 6 |
what happens when sample size >30
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differences between the t-distribution and the z-distribution are extremely small thus,...
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| 7 |
distribution of samples means over repeated sampling from population
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sampling distribution of the mean
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| 8 |
mean of sampling distribution =
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population mean
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| 9 |
what is the basis of the Central Limit theorem
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approaches normal as the sample size (n) increases
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| 10 |
given a population with mean = u and standard deviation = o, the sampling dist of the mean...
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central limit theorem
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| 11 |
what happens when SD is not known?
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cannot plug in SD into formula
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| 12 |
so what do we do without SD?
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two things - replace SD with Sand use t-table instead of z-table (use t-scores instead)
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| 13 |
when does t-distribution become closer to z-score?
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as sample size approaches infinity
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| 14 |
used to adjust shape of distribution based on sample ssize
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degree of freedom
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| 15 |
equation of degree of freedom
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df = n - 1
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