Quantitative Data

Question 1

What is a Skewed Distribution?

Answer 1

• Positive skew is when most of the distribution is concentrated on the left (and may be result of a very difficult test) and a negative skew is when most of the distribution is on the right (result of a very easy test)

Question 2

What is a Scattergram?

Answer 2

• A graph that represents the strength and direction of a relationship between co-variables

Question 3

What is a Normal Distribution?

Answer 3

• Symmetrical bell-shaped curve in which most people occupy the middle area and the mean, median and mode are all at the same central point. Many characteristics in a population, for example height, weight and IQ are normally distributed

Question 4

What is a Histogram

Answer 4

• A type of graph in which the area of each bar represents frequency. The x-axis starts at true zero and is continuous

Question 5

What is a Bar Chart?

Answer 5

• A type of graph in which frequency of each variable is represented by the height of separated bars

Question 6

How are graphs used to represent Qualitative Data?

Answer 6

• Quantitative data (raw scores) is converted to descriptive statistics and can be summarised in a table. Comments/conclusions are then included in a summary paragraph