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Flashcards in Descriptive statistics Deck (16)
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1

Draw __ to check distribution of a continuous variable

Histogram

2

Normal distribution is a probability distribution that is:

symmetric about the center

data near center are more frequent in occurance

a bell curve in graph form

3

More data on the left tail than right

Skewed to the left

4

More data on the left tail than right

Skewed to the right

5

Suggestive of two different populations

Bimodal

6

Most common value for central tendency

not good for data with an outlier or skewed distribution

Mean

7

value in the middle of a ranked data

better for data with an outlier or skewed distribution

Median

8

value that occurs most often

highest bar on histogram

rarely reported for continuous data

Mode

9

if mode > median > mean

data skewed to right

10

if mean > median > mode

data skewed to left

11

Range

maximum - minimum
or as interval (min, max)

common measure for spread of data around median

can be misleader in data with outlier

12

Interquartile range (IQR)

Q3-Q1 or (Q1, Q3)
where:
Q1= value that occurs at 1st quarter mark
Q2= value that occurs at 2nd quarter mark (median)
Q3= value that occurs at 3rd quarter mark

Measures better than range for data with outlier

13

If you count the numbers in each category of a table you are measuring:

Frequency

14

If you find the % of each category of a table you are measuring:

Proportion

15

Charts for continuous data

Histogram and Box plot

16

Charts for categorical data

Pie graph and bar graph