Three variables (X1, X2 and X3) were recorded for a sample of 20 people taken from

attendees of a course. X1 is nationality (1=Irish, 2=English, 3=Welsh, 4=Scottish), X2

is a score on an entrance exam (out of 8) and X3 is time (seconds) spent doing a task.

X1 X2 X3

2 5.2 15.4

4 5.7 16.1

1 5.4 12.4

3 6.2 13.4

1 5.8 15.6

2 4.3 16.8

2 5.2 16.8

1 5.7 14.9

2 6.5 16.7

4 5.5 16.0

1 5.4 5.1

2 5.9 9.1

1 6.2 14.6

4 4.3 13.5

4 4.7 13.8

4 4.6 18.3

1 4.9 12.2

2 5.6 17.4

3 6.4 17.6

1 5.4 16.9

For each of X1, X2 and X3,

(a) Sketch an appropriate graph to display the distribution of the variable.

(b) Use an appropriate method to determine if there are any outliers. Show any workings.

This is my question which i really just cant understand! what graphs should i draw! i drew a bar chart for x1 but i am completely lost for x2? and for question b is the graph an appropriate method?

Thanks for any help