M - Statistics & Mechanics 1 - 3) Representations of data

Question 1

Formula for frequency density and the way to find it on a histogram

Answer 1

• Frequency density = frequency ÷ class size (if data is not scaled)
• Represented by the area of a bar

Question 2

Way to draw a frequency polygon on top of a histogram

Answer 2

Join the middles of the top of each bar

Question 3

Way to compare 2 sets of data

Answer 3

• Measure of location and measure of spread
• Mean and standard deviation or median and interquartile range ONLY
• All in context