Statistics Chapter 3 Representations of Data

Question 1

What is the way to find the outliers?

Answer 1

Outliers are either:
- greater than Q_3 + k(Q_3 - Q_1)
- less than Q_1 - k(Q_3 - Q_1)

Question 2

What is cleaning the data?

Answer 2

The process of removing anomalies from a data set

Question 3

What do&raquo_space; and &laquo_space;denote?

Answer 3

> > is much greater than
&laquo_space;is much less than

Question 4

How are the lowest and highest values (that aren’t outliers) represented on a box plot?

Answer 4

As vertical lines on the value

Question 5

How are the lower quartile, median and upper quartile represented on box plots?

Answer 5

As a box (starting on the lower quartile and ending on the upper quartile) with a line through the median

Question 6

How do you find estimates of the median and quartile for a grouped frequency table?

Answer 6

Draw a cumulative frequency diagram
Plot each point using the upper class boundary for x and the cumulative frequency for y

Question 7

How do you calculate frequency density?

Answer 7

Frequency density = frequency / class width

Question 8

How do you form a frequency polygon?

Answer 8

Joining the middle of the top of each bar in a histogram

Question 9

What can you comment on when comparing data?

Answer 9

• a measure of location
• a measure of spread