Week 2

Question 1

What is a frequency table?

Answer 1

A frequency table is a grouping of qualitative data into mutually exclusive classes showing the number of observations (counts) in each class.

Question 2

What can you do with relative frequency table?

Answer 2

It is possible to convert a frequency table into a relative frequency table so as to move from absolute values to percentage values.

Question 3

Formula for relative class frequency?

Answer 3

relative class frequency = class frequency/number of observations

Question 4

What is a bar chart?

Answer 4

a graph that shows qualitative classes on the horizontal axis and the class frequencies on the vertical axis. The class frequencies are proportional to the heights of the bars

Question 5

What is a pie chart?

Answer 5

a chart that shows the proportion or percentage that each class represents of the total number of frequencies/counts

Question 6

What is a frequency distribution?

Answer 6

A frequency distribution is a grouping of quantitative data into mutually exclusive classes showing the number of observations in each class.

Question 7

What is the 2^k rule

Answer 7

The 2k rule says that the number of classes should be equal to the smallest number (i.e., 𝒌) such that 2^k > n where 𝒏 is the number of observations (or data values) you have available.

Question 8

What is the equation for class width?

Answer 8

Highest observation value (H) - Lowest observation value (L) / number of classes (K) or ((H-L)/K)