Statistics

Question 1

When asked to compare two box plots, what 3 things do you talk about? (2/3 marks)

Answer 1

• Calculate IQR for both
• Compare the spread of data
• Compare medians

Question 2

For a list of data, what is the equation to find the LQ?

Answer 2

n+1 / 4

Question 3

For a list of data, what is the equation to find the UQ?

Answer 3

3(n+1) / 4

Question 4

What does n mean?

Answer 4

How many numbers are in the list.

Question 5

For a list of data, is there an even or odd total?

Answer 5

Always odd

Question 6

For cumulative frequency, can there be both an even odd and an even total?

Answer 6

Yes

Question 7

What is the equation to find the LQ for cumulative frequency when the total is even?

Answer 7

n/4

Question 8

What is the equation to find the UQ for cumulative frequency when the total is even?

Answer 8

3n/4

Question 9

What is the equation to find the LQ for cumulative frequency when the total is odd?

Answer 9

n+1/4

Question 10

What is the equation to find the UQ for cumulative frequency when the total is odd?

Answer 10

3(n+1)/4

Question 11

What is the formula linking Frequency, Frequency Density and Class Width?

Answer 11

Frequency Density = Frequency / Class Width

Question 12

Why is the IQR a better measure of a distribution compared to the range?

Answer 12

Less affected by anomalies.