Summarising and Presenting Quantitative Data

Question 1

numerical summary tool for summarising discrete data

Answer 1

frequency table

Question 2

graphical summary tool for summarising discrete data

Answer 2

line chart

Question 3

cumulative frequency (of a value)

Answer 3

the number of observations which are less than or equal to that value

Question 4

how can you define a frequency for continuous data

Answer 4

look at number of occurrences within an interval

Question 5

what are the intervals called to hold frequency data for continuous data

Answer 5

bins

Question 6

what are some of the properties of bins

Answer 6

first number included, second is not
usually of equal sizes
must cover whole range of observations
must not overlap

Question 7

what is the density formula

Answer 7

relative frequency/width of bin (b-a)

Question 8

how do you draw a histogram for continuous data

Answer 8

rectangles above the chosen bins
the height can represent frequency, relative frequency, percentage frequency, density

Question 9

what is the cumulative frequency for continuous data

Answer 9

number of observations in bins up to and including the current bin

Question 10

cumulative relative frequency formula

Answer 10

cumulative frequency/n

Question 11

what is a drawback of histograms

Answer 11

loss of the actual data

Question 12

what is a stem and leaf plot

Answer 12

a mix of a plot and a table used on small data sets to better preserve the data

Question 13

how can paired continuous variables be compared

Answer 13

scatterplot