Statistics Chapter 3

Question 1

What is the formula to find an outlier?

Answer 1

Either greater than Q3 + k(Q3-Q1) or less than Q1 - k(Q3-Q1)

Question 2

What does cleaning the data mean?

Answer 2

Remove anomalies

Question 3

What does the area of a histogram bar represent?

Answer 3

k x frequency

Question 4

How do you make a frequency polygon from a histogram?

Answer 4

Join the middle of the top of each bar

Question 5

How can two sets of data be compared? (2)

Answer 5

Measures of location

Measures of spread

Question 6

What sort of data can be represented in a histogram?

Answer 6

Grouped, continuous data

Question 7

How do outliers change a box plot? (2)

Answer 7

Use a cross to represent the outlier

The line after the outlier is either the next highest/lowest value (if known) or the boundary for outliers

Question 8

What is an outlier?

Answer 8

An extreme value that lies outside the overall pattern of the data

Question 9

What is an anomaly?

Answer 9

An outlier that is clearly the result of an error and should be removed from the data in order to stop it from being misleading