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Algebra 2 Chapter 11
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Terms in this set (28)
alternative hypothesis, Ha
opposite of the null hypothesis
bias
An error that results in a misrepresentation of members of a population.
binomial distribution
A distribution that shows the probabilities of the outcomes of a binomial experiment.
confidence interval
An estimate of a population parameter, stated as a range with a specific degree certainty.
continuous random variable
The numerical outcome of a random event that can take on any value
discrete random variable
The numerical outcome of a random event that can take on any value.
Empirical Rule
Can be used to determine the area under the normal curve at specific intervals.
expected value E(X)
the weighted average of the values of the variable
experiment
Something that is intentionally done to people, animals or objects, and then the response is observed.
experimental probability distribution
A distribution of probabilities estimated from experiments
hypothesis test
A test used to assess a specific claim about a parameter.
inferential statistics
Statistics like predictions and hypothesis test are used to draw conclusions about a population by using a sample.
maximum error of estimate
The maximum
difference between the estimate of the population mean and its actual value
negatively skewed distribution
A distribution where the mean is less than the median and the majority of the data is on the right of the mean. The tail is the left.
normal distribution
A continuous, symmetric, bell-shaped distribution of a random variable
null hypothesis, Ho
A specific hypothesis to be tested. It is expressed as an equality and is considered true until evidence indicates otherwise.
observational study
Individuals are observed and no attempt is made to influence the results.
parameter
A measure that describes a characteristic of a population.
positively skewed distribution
A distribution where the mean is greater than the median and the majority of the data is on the left of the mean. The tail is the right.
probability distribution
A function that maps the sample space to the probabilities of the outcomes in the sample space for a particular random variable.
random variable
The outcome of a random process that has a numerical value.
standard normal distribution
A normal distribution with a mean of 0 and standard deviation of 1
statistic
A measure that describes an characteristic of a sample
statistical inference
Use information about a sample to draw conclusions about a population.
survey
Used to collect information about a population
symmetric distribution
A distribution where the mean is close to or equal to the medial and the distribution is symmetrical
theoretical probability distribution
A distribution of probabilities based on what is expected to happen
z-value
The number of standard deviations that a given data is from the mean.
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