1.8.6 - Using a frequency distribution to go beyond data

Question 1

What does the size of a bar on a histogram mean?

Answer 1

The probability of an event occurring

Question 2

How do we work out probability density functions?

Answer 2

Plot a graph of value against density. The curve is known as a probability distribution.

Question 3

How can a normal probability distribution tell us the probability of a value occurring?

Answer 3

We can calculate the area under the curve to work out the probability

Question 4

What are the standard scores for a normal distribution?

Answer 4

Mean = 0

Standard Deviation = 1

Question 5

What are z-scores?

Answer 5

Standardised scores

Question 6

What is the equation for calculating z-scores?

Answer 6

individual score - mean of scores, divided by standard deviation

Question 7

What does a large z-score tell us?

Answer 7

The score is far away from the mean

Question 8

What does a positive z-score tell us?

Answer 8

The score is above the mean

Question 9

What does a negative z-score tell us?

Answer 9

The score is below the mean