vocab for senior exam

Null hypothesis

hypotheses that contains a statement of equality

Alternative hypothesis

Is the complement of the null hypothesis

Type 1 error

Occurs if the null hypothesis is rejected when its true

Type 2 error

Occurs if the null hypothesis is not rejected when its false

Point estimate for P

A value that is used to estimate the unknown population proportion

T- Distribution

X bar - mew \ s\ square root of n

Confidence interval for population mean mew

X bar - E < mew < X bar + E

Level of confidence C

The probability that the values of a parameter falls within a specified range of values

Central limit theorem

When samples are large enough, the means of those samples will be normally distributed.

Z score

Measures how many standard deviations away from the mean

Poisson distribution

Discrete probability distribution that expresses the chances of achieving success

Geometric distribution

Discrete probability distribution that describes the chances of achieving success

Expected value

A weighted average of possible values of a random variable

Discrete probability distribution

Shows the possibilities of all outcomes of a discrete random variable

nPr

The number of permutations of “n” objects taken “r” at a time,

nCr

Calculates the number of ways to select of “r” items of “n” items

P(A or B) mutually exclusive

Cannot happen at the same time

P(A and B) independent

Happens at the same time

Coefficient of variations

The ratio of the standard deviations to the mean

Ordial level of measurement

Involves data that can be categorized and ranked