Organizing And Displaying Data

Question 1

What is rank order distribution?

Answer 1

Ordered listing of data in a single column (useful with relatively small numbers)

Question 2

What is range (R)?

Answer 2

Distance from highest to lowest value

Question 3

Simple frequency distribution

Answer 3

The number of cases (f) at each given value

Question 4

Grouped frequency distribution

Answer 4

Grouped data into bins which is a range of values. The number of persons who performed in each group of scores

Question 5

How can data be displayed?

Answer 5

1. Spreadsheet (table)
2. Graphs - histogram (bar graph) or frequency polygon (line graph)

Question 6

Curve

Answer 6

A line that results when scores (x) are plotted against frequency (y) on a graph

Question 7

Normal curve

Answer 7

• bell shaped
• symmetrical
• mean, median and mode are all the same
• frequency of scores declines in a predictable manner as scores deviate farther and farther form the centre

Question 8

Central limit theorem

Answer 8

A sum of random numbers becomes normally distributed as more and more of random numbers are added together

Question 9

Bimodial curve

Answer 9

Distribution that has two modes

Question 10

Skewed curve

Answer 10

Distribution where a disproportionate number of subjects score toward one end of the scale (negative or positive skew)

Question 11

How do you know if data is presented in a normal curve?

Answer 11

1. Symmetrical curve
2. Asymptotic - line that never fully reaches zero
3. Mean, median and mode are all the same