module 16

Question 1

normal curve

Answer 1

a symmetrical bell-shaped frequency polygon representing a normal distribution

Question 2

normal distribution

Answer 2

theoretical frequency distribution that has certain special characteristics
mean median and mode are equal and located in center of distribution

Question 3

kurtosis

Answer 3

how flat or peaked a normal distribution is

Question 4

mesokurtic

Answer 4

normal curves with medium height and breadth

Question 5

leptokurtic

Answer 5

normal curves that are tall and thin

Question 6

plattkurtic

Answer 6

normal curves that are short and relatively dispersed

Question 7

positively skewed distribution

Answer 7

peak is to the left of the center point and the tail extends to the right (positive direction)

Question 8

negatively skewed distribution

Answer 8

the peak is the right of the center point and the tail extends to the left (negative direction)

Question 9

z score (standard score)

Answer 9

a number that indicates how many standard deviation units a raw score is from the mean of a distribution

Question 10

standard normal distribution

Answer 10

a normal distribution with a mean of 0 and a standard deviation of 1

Question 11

percentile rank

Answer 11

indicates the percentage of people who scored at or below a given raw score

Question 12

pearson product moment correlation coefficient

Answer 12

most commonly used when both variables are measured on an interval or ratio scale (pearson’s r)

Question 13

coefficient of determination (r squared)

Answer 13

measure of the proportion of the variance in one variable that is accounted for by another variable

Question 14

spearman’s rank order correlation coefficient

Answer 14

used when one or more of variables are measured on an ordinal scale

Question 15

point biserial correlation coefficient

Answer 15

used when one of the variables is measured on a dichotomous nominal scale and the other is measured on an interval or ratio scale

Question 16

phi coefficient

Answer 16

both measured variables are dichotomous and nominal

Question 17

regression analysis

Answer 17

a procedure that allows us to predict an individual’s score on one variable based on knowing one or more other variables