Representations of data

Question 1

Why histograms?

Answer 1

• data is continuous
• given in grouped freq. table

Question 2

What does it mean to have higher standard deviation?

Answer 2

data ↑ spread out

Question 3

Asuumption made when using linear interpolation to estimate data.

Answer 3

Temperatures are equally distributed throughout the range

Question 4

Advantages of box plots

Answer 4

1. clear + easy to understand
2. see spread easily

Question 5

Disadvantages of box plots

Answer 5

1. easily misinterpreted
2. original data x clearly shown

Question 6

Evaluate use of culmulative frequency diagrams

Answer 6

• shows how the data is spread
  ➕ estimation of median + quartiles
  ➖ tells little about individual data points

Question 7

State one feature of histograms.

Answer 7

• area of bar proportional to freq.