T3: Frequency Distributions

Question 1

What are descriptive statistics?

Answer 1

A collection of methods for classifying and summarising date

Question 2

What are the types of descriptive statistics?

Answer 2

Measures of central tendency and measures of variability

Question 3

What is a frequency distribution?

Answer 3

A count of the number of occurrences of each different value in the data set

Question 4

How do you make a FD with a narrow dataset?

Answer 4

Count the frequency of each value of the DV and make a graph, X values of DV and Y frequency

Question 5

How do you make a FD with a wide dataset?

Answer 5

Group data into clusters that form a class interval and count the width of the interval eg 5, choose an odd interval width which allows a midpoint

Question 6

What is a continuous variable?

Answer 6

Data that can take on any value on the measurement scale eg IQ and height

Question 7

What is an exact limit?

Answer 7

1/2 unit above and below the values of the class interval

Question 8

How do we calculate the midpoint using exact limit?

Answer 8

Lower exact limit + 1/2 class interval width

Question 9

Why do we find a point of frequency and how?

Answer 9

It tells us how the values are distributed and if they are evenly distributed or just higher frequency of occurrence in some parts
Putting it on a graph

Question 10

What are the two data curves?

Answer 10

Frequency polygon and histogram