T tests

Question 1

define standard deviation

Answer 1

spread of data around the mean

Question 2

what does a p value greater than 0.05 (5%) mean

Answer 2

there is MORE than 5% probability that the result is due to chance

there is NO significant difference

Question 3

what does a p value smaller than 0.05 mean

Answer 3

there is LESS than 5% probability that the result is due to chance

there IS a significant difference

Question 4

what does overlap between standard deviations mean

Answer 4

no significant difference

Question 5

what is a null hypothesis

Answer 5

there is no significant difference
so result is due to chance

Question 6

when do we accept the null hypothesis

Answer 6

when p value is ABOVE 0.05
there is no significant difference

Question 7

when do we reject the null hypothesis

Answer 7

when p value is BELOW 0.05
there is a significant difference

Question 8

what is meant by a significant difference

Answer 8

means the results are NOT due to chance