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