DATA ANALYSIS

Question 1

What is a t-test?

Answer 1

a test used to compare means to see if there’s a significant difference between 2 means

Question 2

What is a null hypothesis?

Answer 2

there is no significant difference between mean 1 and mean 2

Question 3

What does it mean if t-test statistic is greater than value on critical values table?

Answer 3

there’s more than 95% probability that the difference is not due to chance therefore the difference is significant

Question 4

What is standard deviation?

Answer 4

spread/variation about the mean

Question 5

How can standard deviation be plotted on graphs?

Answer 5

error bars (total length of error bar is 2x SD)

Question 6

What does it mean if the SD/error bars of 2 sets of data overlap?

Answer 6

difference is due to chance and is therefore insignificant

Question 7

What does it mean if the SD/error bars of 2 sets of data don’t overlap?

Answer 7

difference is not due to chance and is therefore significant