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Unit 1: Descriptive Statistics questions n answers graded A+
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Unit 1: Descriptive Statistics questions n answers graded A+
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Unit 1: Descriptive StatisticsBias
a factor in statistics that causes a difference between results and facts
Confidence Interval
probability that a population parameter will fall within a given range of values
Confounding Variable
variable that affects other variables in a way that produces distorted results
Empirical Rule
statistical fact stating that about 99.7% of data falls within 3 standard deviations of the mean, 95% within
2 standard deviations of the mean, and 68% within one standard deviation of the mean
Experiment
procedure used to test a hypothesis but applying a treatment to one group and comparing results to a
control group
Margin of Error
statistic expressing the amount of random sampling error in the results of a survey
, Normal Distribution
a probability distribution that appears as a "bell curve" when graphed. The normal distribution describes
a symmetrical plot of data around its mean value, where the width of the curve is defined by the
standard deviation.
Observational Study
type of study in which individuals are observed and data is recorded
Population Distribution
model that describes how a random variable varies
Random Sample
sampling technique in which each sample has an equal probability of being chosen
Sample Data Distribution
probability distribution obtained through repeated sampling of a given population
Sample Statistics
piece of information obtained from a sample
Sample Survey
survey that is administered to a selected set of individuals to represent the target population
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