Descriptive statistics Flashcards

1
Q

Draw __ to check distribution of a continuous variable

A

Histogram

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2
Q

Normal distribution is a probability distribution that is:

A

symmetric about the center

data near center are more frequent in occurance

a bell curve in graph form

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3
Q

More data on the left tail than right

A

Skewed to the left

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4
Q

More data on the left tail than right

A

Skewed to the right

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5
Q

Suggestive of two different populations

A

Bimodal

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6
Q

Most common value for central tendency

not good for data with an outlier or skewed distribution

A

Mean

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7
Q

value in the middle of a ranked data

better for data with an outlier or skewed distribution

A

Median

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8
Q

value that occurs most often

highest bar on histogram

rarely reported for continuous data

A

Mode

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9
Q

if mode > median > mean

A

data skewed to right

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10
Q

if mean > median > mode

A

data skewed to left

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11
Q

Range

A

maximum - minimum
or as interval (min, max)

common measure for spread of data around median

can be misleader in data with outlier

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12
Q

Interquartile range (IQR)

A

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

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13
Q

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

A

Frequency

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14
Q

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

A

Proportion

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15
Q

Charts for continuous data

A

Histogram and Box plot

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16
Q

Charts for categorical data

A

Pie graph and bar graph