exam 2

__ are procedures used to summarize, organize, and make sense of a set of scores or observations

descriptive stats

____ are procedures used to generalize from a sample to a population.

inferential stats

if relative frequencies are expressed as proportions, the sum of the relative frequencies across all intervals is equal to

one

true or false? the probability off an outcome is the same as the relative frequency of its outcome

true

two outcomes are ___ if the probability of both of them occurring at the same time is zero

mutually exclusive

____ is the proportion or fraction of times n outcome is likely to occur

probability

If relative frequencies are expressed as proportions, the sum of the relative frequencies across all intervals is equal to ____

one

two outcomes (A and B) are mutually exclusive, where p(A)= .45 and p(B)= .28

what is the probability of A **and** B

zero

two outcomes (A and B) are mutually exclusive, where p(A)= .45 and p(B)= .28

what is the probability of A **or** B

.73

Two outcomes (A and B) are mutually exclusive, where p(A)= .31 and p(B)= .39

what is the probability of A **and** B

0

Two outcomes (A and B) are mutually exclusive, where p(A)= .31 and p(B)= .39

what is the probability of A **or** B

.70

A ___ is the distribution of probabilities for each outcome of a random variable.

probability distribution

The probabilities for all possible outcomes of a given random variable sum to what value?

one

If relative frequencies are expressed as proportions, the sum of the relative frequencies across all intervals is equal to ____

one

The probabilities for all possible outcomes of a given random variable sum to what value?

one

True or false? The probability of an outcome is the same a the relative frequency of its outcome

true

The area between any two points under a normal curve ranges between 0 and 1 and can never be negative. What concept also has these same characteristic

probability

p=.0701

What is the decision for a hypothesis test at a .05 level of significance

retain

z=-2.14

What is the decision for a hypothesis test at a .05 two-tailed level of significance?

reject

What type of error goes with retain?

type 2

What type of error goes with reject?

type 1

According to the central limit theorem, if the mean of the population is 25, what is the mean of the sampling distrib of the mean (um)?

25

sdm=u

what are the 4 steps of hypoth testing

1. setting the criteria
2. making a decision
3. calculate the statistic
4. make a decision

the decision in hypoth testing is to retain or reject which hypoth? null or alt?

null

p=.0689

What is the decision for a hypothesis test at a .05 level of significance

reject

z=1.84

What is the decision for a hypothesis test at a .05 two-tailed level of significance?

retain

zcrit

the zscore we are trying to find (define the cutoff, found in table)

zobs

the zscore calculated (calc with formula)

a level

usually .05 or .01

how extreme the scores will be

null hypoth

no change

alt hypoth

what you think is gonna happen

research hypoth

same at alt hypoth