10.6 Representing variation graphically

Question 1

What is discontinuous variation? (1 mark)

Answer 1

A characteristic that can only result in certain values.

Question 2

Is sex a discontinuous or continuous characteristic? (1 mark)

Answer 2

Discontinuous

Question 3

What is continuous variation? (1 mark)

Answer 3

A characteristic that can take any value within a range.

Question 4

What is standard deviation? (1 mark)

Answer 4

Standard deviation is a measure of how spread out the data is.

Question 5

What are the two types of t-tests? (2 marks)

Answer 5

Unpaired
Paired

Question 6

How do you calculate the degrees of freedom for an unpaired t-test? (1 mark)

Answer 6

n1 + n2 - 2

Question 7

How do you calculate the degrees of freedom for a paired t-test? (2 marks)

Answer 7

n - 1
Where n is he number of pairs

Question 8

When is an un-paired t-test used? (2 marks)

Answer 8

If there is a statistically significant difference between two means, from two sets of data.

Question 9

When is a paired t-test used? (2 marks)

Answer 9

If there is a statistically significant difference between two means , from two sets of data, from the same individual.

Question 10

What statistical test is used to show that two sets of data are related? (2 marks)

Answer 10

Spearman’s rank correlation coefficient

Question 11

What is the spearman’s rank correlation coefficient similar to? (1 mark)

Answer 11

A hypothesis test