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Biology > Statistics > Flashcards

Statistics Flashcards

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AP® Biology flashcards Biology 101 flashcards
0
Q

Error bars

A

A graphical representation of the variability of data

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1
Q

Standard Deviation

A

Used to summarize the spread if values around the mean

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2
Q

How many values fall within one standard deviation of the mean?

A

68%

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3
Q

How is standard deviation useful?

A

For comparing the means and the spread of data between two or more samples

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4
Q

Qualitative data

A

Non-numerical

Ex. Sex, color, shape

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5
Q

Ranked data

A

Can be put on a scale that represents an order

Ex. Abundance - very-common-rare

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6
Q

Qualitative data

A

Can be measured

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7
Q

Three types of data

A

Qualitative
Ranked
Quantitative

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8
Q

When is quantitative data used

A

For experiments

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9
Q

Two types of quantitive data

A

Continuous

Discontinuous

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10
Q

Continuous data

A

Can take any numerical value

Ex. Height, weight, number

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11
Q

Discontinuous data

A

Only take specific values

Ex. Shoe sizes

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12
Q

What is the purpose of statistics?

A

Allows you to see the distribution of data

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13
Q

Features of distribution of data

A

Central tendency

Spread

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14
Q

Null hypothesis

A

(Ho) - no significant difference between the growth of the two groups

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15
Q

Mean

A

A simple measure of the central tendency of the data

16
Q

Median

A

Middle value when data is arranged in number oval order

17
Q

Mode

A

Most common value

18
Q

Range

A

Difference between the smallest and largest data value

19
Q

Descriptive stats

A

Mean
Median
Mode
Range

20
Q

Important things for graphing:

A
  • Descriptive title
  • Uncertainties included
  • Consistent number of decimal points
21
Q

Types of distribution:

A

Normal distribution
Skewed distribution
Biomodal distribution

22
Q

Normal distribution

A

Data spread symmetrically about the MEAN and MEDIAN

23
Q

Skewed distribution

A

A good measure of central tendency in MEDIAN

24
Q

bio modal distribution

A

We use MODE to identify the tendency in data

25
Q

Standard deviation

A
  • A measure of variation
  • Used to summarize the spread of values around the mean
  • presented in the form: x (+/-) s
26
Q

What percentage of data lie within 2s of the mean?

A

95%

27
Q

s

A

Standard deviation

28
Q

How is a lower range of numbers useful in relation to s?

A

A small s indicated that the data is clustered closely around the mean value

29
Q

How is more range of numbers useful in relation to s?

A

A large s indicated a wider spread around the mean

30
Q

Significantly different s

A

No overlap between s of the two means

31
Q

What are inferential stats based on?

A

Samples

32
Q

What are inferential stats used for?

A

To estimate population parameters which allows us to make conclusions about the studies aspect of the population

Biology (6 decks)

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