STATS MT Flashcards
calculation of probabilities of a population to make prediction and decisions
STATISTICS
what does continuous type of data requires
NORMAL PROBABILITY DISTRIBUTION
a probability distribution of continuous random variables
NORMAL PROBABILITY DISTRIBUTION
what is the shape of distribution curve
BELL
where is the relation of curve and center
SYMMETRICAL
what coincide at the center
MEAN MEDIAN MODE
what flatten out indefinitely along the horizontal axis but never touch
TAILS OF THE CURVE
what is the area under the curve
ONE
2 factors that affect the normal curve
MEAN
STANDARD DEVIATION
shifts the graph of the normal curve to the right or to the left
CHANGE OF VALUE OF MEAN
what determines the shape of the graphs
STANDARD DEVIATION
when standard deviation is large?
NORMAL CURVE IS SHORT AND WIDE
when standard deviation is small?
NORMAL CURVE IS TALL AND SKINNIER
a normal probability distribution that has myu equals 0 and standard deviation equals to 1
STANDARD NORMAL CURVE
refers to 68-95-99.7 percent
EMPERICAL RULE
measure of relative standing
Z SCORE
number of standard deviation a given value x is above so below the mean
Z SCORE
distance between a given value x and to the mean
STANDARD SCORE
useful for comparing observed values
STANDARD SCORE
if one score is positive and one score is negative
ADD SCORES
if both score in same direction ( both left / both right )
SUBTRACT SCORES
positive scores going to the right
SUBTRACT 0.5
positive scores going to the left
ADD 0.5
negative scores going to the right
ADD 0.5
