STATS 3 Flashcards
we cqalculate probabilities of a population to make predictions and decisions
STATISTICS
a probabilty distribution of continuos random variables
NORMAL PROBABILTY THEOREM
statictical conept that the sample mean distribution of a random varibale will assume a near normal or normal
CENTRAL LIMIT THEOREM
mean is equal to what?
POPULATION MEAN
what is the shape of normal curve
BELL SHAPE
another name for t distribution
STUDENTS DISTRIBUTION
used to estimate population parameters when the sample size is small and/or when the population variance is unknwn
T DISTRIBUTION
t distribution has what greater value than 1
VARIANCE AND STANDARD DEVIATION
t distbution has more area where?
TAILS
formula for t distribtion
X BAR MINUS M OVER S OVER SQUARE ROOT OF N
formula for mean
JUST COPY MEAN
formula for standard deviation
STANDARD DEVIATION OVER SQUARE ROOT OF N
ormula for variance
VARIANCE OVER N
when degree of freedom is given
DO NOTHING
when n is given
MINUS ONE
refers to the probability that the confidence interval contains the true population parameter
CONFIDENCE LEVEL
formula for confidence level
(1-A) 100%
assumption or idea that is proposed to the sake of an argument so that it can be tested
HYPOTHESIS
constructed before research apart from background review
SCIENTIFIC METHOD
making generalization about the population using a sample
HYPOTHESIS TESTING
statement about the numerical value of a population parameter
STATISTICAL HYPOTHESIS
if found to be true
ACCEPTED
if found to be false
REJECTED
denoted by Ho, a tatement that there is n difference between a parameter and specific value
NULL HYPOTHESIS
denoted by Ha , the opposite or negation of the null hypothesis
ALTERNATIVE HYPOTHESIS
always expressed with equal sign
NULL
expressed with inequality signs
ALTERNATIVE
words that refer to null
IS EQUAL TO
THE SAME AS
NOT CHANGED FROM
words that refer to unequal sign
NOT EQUAL
DIFFERENT FROM
CHANGED FROM
NOT THE SAME AS
words that refer to >
GREATER THAN
ABOVE
HIGHER THAN
LOWER THAN
BIGGER THAN
INCREASED
ATLEAST
words that refer to <
LESS THAN
BELOW
LOWER THAN
SHORTER THAN
SMALLER THAN
DECREEASED
AT MOST
test of any statistical hypothesis where the alternative hypothesis is expressed since the critical value or rejection region lies entirely in one tail of the sampling distribition
DIRECTIONAL TEST
where the alternative hypothesis is written with a not equal sign
NON DIRECTIONAL TEST
occurs when we reject the null hypothesis when it is true
TYPE 1 ERROR
another name for type 1 error
ALPHA ERROR
occured when we accept the null hypothesis when it is false
TYPE 2 ERROR
another name for type 2 error
BETA ERROR
value of a tells us the probability of making an error in rejecting the null hypothesis when its actually true
LEVELS OF SIGNIFICANCE
pag tama naman pero nireject
TYPE 1 ERROR
pag mali pero pinipilit i accept
TYPE 2 ERROR
