2.2 Other measures of location

Question 1

What does the median describe?

Answer 1

» The average of the data set as it is the middle

Question 2

What is the lower quartile?

Answer 2

» One quarter of the way through the data set

Question 3

What is the upper quartile?

Answer 3

» Is three quarters of way through the data set

Question 4

What is a percentile?

Answer 4

» Splits the data set into 100 parts

Question 5

How can you find the lower quartile?

Answer 5

» Divide n by 4
» If a whole number, the lower quartile is halfway between this number and the next
» If not a whole number round up and pick this data point

Question 6

How to find the upper quartile?

Answer 6

» Find 3/4 of n
» If a whole number, the lower quartile is halfway between this number and the next
» If not a whole number round up and pick this data point

Question 7

What is interpolation?

Answer 7

» You assume the data values are evenly distributed within each class

Question 8

How can you write the percentile?

Answer 8

» As P
» Such as P(10)

Question 9

When do you use interpolation?

Answer 9

» When its a grouped frequency table