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21 Cards in this Set
- Front
- Back
takes numerical values for which arithmetic operations such as adding and average make sense
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Quantitative
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- places an individual into one of several groups or categories
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categorical
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- making decisions or predictions based on data
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inference
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- numerical summary of a sample taken from a population
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statistic
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the mean plus/minus the confidence level multiplied by the stardard deviation divided by the square root of the sample size
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confidence interval
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a. tail to the right
b. tail to the left |
a. skewed to the right
b. skewed to the left |
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Q3 - Q1 = ?
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IQR
= InterQuartile Range |
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minimum = lowest number
Q1 = first quartile median = middle number Q3 = thrid quartile maximum = highest number (sometimes mean = average mode = most often) |
five number summary
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- an observation that falls well above or well below the bulk of the data
- does not seem to be in accord with the other values in the data |
outlier
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- the cause and effect relation between two variables
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correlation coefficient
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- deliberately imposes some treatment on individuals in order to observe responses
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experiment
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- observes individuals and measures variables of interest but does not influence/interfere
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observational study
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- a sample consisting of those people who choose themselves by responding to a general appeal
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voluntary response sample
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- racial predjudice on the part of the experimenters
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bias
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- a sample size of N chosen in such a way that every set of N units in the population has an equal chance to be the sample actuallt selected
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simple random sample
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- round up (whole numbers only; no decimals)
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sample size (can not have a decimal of a person)
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- leave as is with either two or three decimal places after
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confidence interval and margin of error
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x bar - m
over standard deviation over square root of N |
many
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x bar - m
over standard deviation |
one
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- the difference between an observed value of the response variable and the value predicted by the regression line
? = observed y - predicted y ? = y - y(hat) |
residual
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- the direction and stength of the linear relationship between two quantitative variables (R)
R = 1/ N - 1 times the sum of (x1 - xbar / sx) times (y1 - ybar / sy) |
correlation
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