# algebra 2 topic test 2 vocabulary

random sample
all members of the population are equally likely to be chosen
normal distribution
has data that vary randomly from the mean
percentiles
the value below which a percentage of data falls
measures of variation
describes how the data in a data set are spread out
sample
a part of a population
outlier
a number that is very far from the other numbers in the set
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median
the middle number in an ordered set of numbers
standard deviation
measures showing how much data values deviate from the mean
margin of error
helps you find the interval in which the mean of the population is likely to be, it’s based on the size of the sample and the confidence level desired
conditional probability
the probability of an event B in relationship to an event A is the probability that even B occurs given that event A has already occurred
z score
the number of standard deviations that a value, x, is above or below the mean
binomial experiment
experiment that has a fixed number of trials, each trial is independent of the others, only two outcomes, and probability of each outcome remains constant from trial to trial
measures of central tendency
the mean, median, mode, and standard deviation of a set of data
standard normal curve
a “bell-shaped” curve for standard normal distribution
mean
the sum of the values in the set divided by the number of items in the set
range of a data set
the difference between the highest and lowest values in the set
mode
the value or values that occur most often in a set
confidence level
the percentage of all possible samples that can be expected to include the true population parameter