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HL Biology > Statistical Analysis > Flashcards

Flashcards in Statistical Analysis Deck (22):
1

What does mean mean?

a measure of the central tendency of a data set

2

What does range mean?

the difference between the maximum and minimum values

3

How do you calculate mean?

Mean = sum of all values/sample size

4

What is a measure of the central tendency of a data set?

mean

5

What is the difference between the maximum and minimum values?

range

6

What are error bars?

a graphical representation of the variability of data

7

What is a graphical representation of the variability of data?

error bars

8

What do the error bars tell the reader?

whether data are close to the mean or spread out

9

What is standard deviation?

measure of the spread of most of the data

10

What is the measure of the spread of most of the data?

standard deviation

11

How much of the data falls within +/- 1 standard deviation of the mean?

68%

12

Why do we use a T-Test?

to determine if two populations are significantly different or not

13

If P=1 what does that tell us about the data?

the two data sets are exactly the same

14

If P=0 what does that tell us about the data?

the two data sets are not at all the same

15

If P<0.05 what does that tell us about the data?

the two data sets are significantly different (but share some data)

16

If P>0.05, what does that tell us about the data?

the two sets of data are not significantly (although the means may seem different, they share too much data)

17

What is the value of P if the two data sets are exactly the same?

P=1

18

What is the value of P if the two data sets are not at all the same?

P=0

19

What is the value of P if the two data sets are significantly different (but share some data)?

P<0.05

20

What is the value of P if the two sets of data are not significantly (although the means may seem different, they share too much data)?

P>0.05

21

What is a null hypothesis?

H0: there is no significant difference between data sets

22

What is an alternate hypothesis?

H1: there is a significant difference between data sets

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