Summarising & Analysing Data

Question 1

Z score =

Answer 1

(Variable - mean) / Standard deviation

Question 2

Range =

Answer 2

Highest observation - Lowest observation

Question 3

Variance =

Answer 3

a) Difference between observation and mean (use mid point for grouped data)
b) Square the difference above
c) x Number of times occurred
d) Average of total

Question 4

Standard deviation =

Answer 4

√variance

Question 5

Coefficient of variation =

Answer 5

Standard deviation/Mean

Question 6

Expected values

Answer 6

= Σ (Each outcome x Probability)