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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
Quantitative
- places an individual into one of several groups or categories
categorical
- making decisions or predictions based on data
inference
- numerical summary of a sample taken from a population
statistic
the mean plus/minus the confidence level multiplied by the stardard deviation divided by the square root of the sample size
confidence interval
a. tail to the right

b. tail to the left
a. skewed to the right

b. skewed to the left
Q3 - Q1 = ?
IQR
=
InterQuartile Range
minimum = lowest number
Q1 = first quartile
median = middle number
Q3 = thrid quartile
maximum = highest number

(sometimes mean = average
mode = most often)
five number summary
- 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
- the cause and effect relation between two variables
correlation coefficient
- deliberately imposes some treatment on individuals in order to observe responses
experiment
- observes individuals and measures variables of interest but does not influence/interfere
observational study
- a sample consisting of those people who choose themselves by responding to a general appeal
voluntary response sample
- racial predjudice on the part of the experimenters
bias
- 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
simple random sample
- round up (whole numbers only; no decimals)
sample size (can not have a decimal of a person)
- leave as is with either two or three decimal places after
confidence interval and margin of error
x bar - m
over
standard deviation
over
square root of N
many
x bar - m
over
standard deviation
one
- 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
- 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