Statistical Analysis

Question 1

What does mean mean?

Answer 1

a measure of the central tendency of a data set

Question 2

What does range mean?

Answer 2

the difference between the maximum and minimum values

Question 3

How do you calculate mean?

Answer 3

Mean = sum of all values/sample size

Question 4

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

Answer 4

mean

Question 5

What is the difference between the maximum and minimum values?

Answer 5

range

Question 6

What are error bars?

Answer 6

a graphical representation of the variability of data

Question 7

What is a graphical representation of the variability of data?

Answer 7

error bars

Question 8

What do the error bars tell the reader?

Answer 8

whether data are close to the mean or spread out

Question 9

What is standard deviation?

Answer 9

measure of the spread of most of the data

Question 10

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

Answer 10

standard deviation

Question 11

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

Answer 11

68%

Question 12

Why do we use a T-Test?

Answer 12

to determine if two populations are significantly different or not

Question 13

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

Answer 13

the two data sets are exactly the same

Question 14

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

Answer 14

the two data sets are not at all the same

Question 15

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

Answer 15

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

Question 16

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

Answer 16

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

Question 17

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

Answer 17

P=1

Question 18

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

Answer 18

P=0

Question 19

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

Answer 19

P<0.05

Question 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)?

Answer 20

P>0.05

Question 21

What is a null hypothesis?

Answer 21

H0: there is no significant difference between data sets

Question 22

What is an alternate hypothesis?

Answer 22

H1: there is a significant difference between data sets