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22 Cards in this Set
- Front
- Back
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population parameter
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numerical summary of the population
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sample statistics
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numerical summary of the sample
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notations for sample statistics
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English letters
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notation for population parameters
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Greek letters
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relationship between percentage in population and probability
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direct correspondence, same value
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how to overcome "changing the shape" of the population when taking out more than one sample?
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pretend the population is infinite
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population distribution
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"shape" of the population
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how is population distribution represented for categorical/discrete numerical data?
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relative-frequency bar chart
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how is population distribution represented for continuous numerical data?
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relative-frequency curve
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We use probability distribution to describe the ________ of a random variable
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randomness
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random variable must represent a...
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number, not a word
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population distribution is _______ to probability distribution if you're just taking one observation
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essentially equivalent
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If 30% have no siblings, then what is the probability that all 5 of people chosen have no siblings
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30/100*30/100*30/100*30/100*30/100
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properties of a normal distribution
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many real life examples
symmetric (skewness=0) bell shaped not too flat or peaked (kurtosis=0) |
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normal distribution is uniquely defined by specifying its...
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mean and variance/standard deviation
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normal distribution has majority of data from...
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-3 standard deviations from mean to +3 standard deviations from mean
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standard score
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standard score = (random variable - mean) / standard deviation
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normality check using standard score/standard deviation
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68-95-99.7 rule
68% within 1 standard deviation of mean 95% within 2 standard deviations of mean 99.7% within 3 standard deviations of mean |
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negative skewness
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skewed left
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positive skewness
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skewed right
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small value for kurtosis
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flatter
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larger value for kurtosis
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more peaked
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