levels of measurement

Question 1

nominal

Answer 1

Category data - results that fall into 2 or more names categories, the groups are not related in any way that would mean they could fall on a scale.
Use bar chart.

Question 2

ordinal

Answer 2

The results are points from a scale and relate to each other so they could be put into order. The value of points increases along the scale but the gap between the points does not have to be equal. Data can be ordered in some way.
Use bar chart

Question 3

interval

Answer 3

Points are scored on a scale and increase in value, the divisions within the scale are equal, such as minutes.

Question 4

central tendency

Answer 4

Nominal is category data - we can only ever see which is the most common therefore mode is used.
Ordinal is ranked data - there is no equal measure between each score, so not appropriate to use the mean, but could find the middle average so median is used.
Interval data has the most precise measurement and therefore the sensitive nature of the mean is a good measure.