S1 - representation and summary of data - location

Question 1

quantitative variables

Answer 1

variables associated with numerical observations

Question 2

qualitative variables

Answer 2

variables associated with non-numerical observations

Question 3

continuous variable

Answer 3

a variable that can take any value in a given range

Question 4

discrete variable

Answer 4

a variable that can take only specific values in a given range

Question 5

cumulative frequency

Answer 5

the running total of the frequencies

Question 6

grouped data

Answer 6

when data presented as a grouped frequency table, the specific data values are lost.

Question 7

the groups are more commonly known as ______.

Answer 7

classes

Question 8

you need to be able to find ___________, ___________ and ____________.

Answer 8

class boundaries, mid-point of a class and class width

Question 9

measure of location/ average

Answer 9

a set of data can be summarized by giving a single number to describe its center.

Question 10

there are three alternative measures of location

Answer 10

mode, the median and the mean

Question 11

what is the mode

Answer 11

the mode is the value that occurs most often

Question 12

what is the median

Answer 12

the median is the middle value when the data is put in order.

Question 13

what is the mean

Answer 13

the sum of all the observations divides by the total number of observations

Question 14

the mean of a sample of 25 observations is 6.4. the mean of a second sample of 30 observations is 7.2. calculate the mean of all

Answer 14

6.84

Question 15

modal class

Answer 15

the class with the highest frequency

Question 16

the median

Answer 16

divide n by 2

Question 17

interpolation

Answer 17

we can find the median by using interpolation

Question 18

coding

Answer 18

there are any different way of coding.

(x-a)/b