Chapter 2 - Measures of location and spread

Question 1

what is the mode/modal class?

Answer 1

value or class that occurs most often

Question 2

What is the median?

Answer 2

middle value when the data values are put in order

Question 3

How do you calculate mean?

Answer 3

x bar = sum of all data / number of data values

Question 4

how do you work out mean in a frequency table?

Answer 4

x bar = sum of xf / xf

Question 5

How do you work out the lower quartile for discrete data?

Answer 5

divide n by 4, lower quartile is halfway between this data point and the one above

Question 6

How do you find the upper quartile

Answer 6

3/4 of n, halfway between this data point and the one above

Question 7

What is the range?

Answer 7

differance between the largest and smallest values in the data set

Question 8

What is the interquartile range?

Answer 8

the differance between the upper quartile and the lower quartile

Question 9

What is the inter-percentile range/

Answer 9

differance between the values for two given percentiles