Flashcards in Descriptive Statistics Deck (17):

1

## Nominal

###
exhaustive and mutually exclusive categoies

(categorical)

2

## ordinal

###
ordered

(categorical)

3

## interval

###
equal distances between scores

calculate differences but not proportions

(discrete or continuous)

4

## Ratio

###
interval + a true zero

percent correct, 50% is twice as accurate 25%

(discrete or continuous)

5

## mean

###
interval, ratio

(central tendency)

6

## median

###
ordinal, interval, ratio

(central tendency)

7

## mode

###
all types

(central tendency)

8

## min, max, range, interquartile range

### measures of variability

9

## standard deviation

### dispersion of scores around the mean

10

## standard error of the mean

### How far is the sample mean likely to be from the population mean?

11

## visualization of data

### pie chart, scattor plot, bar graph, line graph

12

## normal distribuation

###
"gaussian curve"

largest number of observations at the center

2/3 of observations will fall within 1 SD of mean

13

## skewed

###
more extreme scores in one direction

negatively skewed more scores towards right

named by tail side

14

## kurtosis

### peakedness and shape of tails

15

## z score

###
how many SD above or below the mean

relate normal distribution to other z scores

16

## t distrubuation

###
shift and scaled so that m = 50 and sd =10

this is used for small sample sizes and unknown population standard dev

17