W1 Chapter 3A - Raw Scor Transformations

Question 1

What are the 4 types of raw score transformations?

Answer 1

1. Percentiles and percentile ranks
2. Standard scores
3. T Scores
4. Normalised standard scores

Question 2

What is a percentile?

Answer 2

The percentage of people in a standardisation sample who scored below a specific raw score

Question 3

What does a percentile not represent?

Answer 3

The percentage of questions answered correctly

Question 4

What are the most common type of raw score transformation?

Answer 4

Percentiles

Question 5

What is the disadvantage of percentiles?

Answer 5

They distort the underlying measurement scale, especially at the extremes

Question 6

What does the standard score represent?

Answer 6

The distance from the mean in standard deviation units.

Question 7

What is the standard score also known as?

Answer 7

The z score

Question 8

When raw scores are transformed to standard scores, what are the values of the mean and the variance?

Answer 8

The mean is always 0 and the variance is always 1

Question 9

Standardised scores are always expressed as positive whole numbers. True or False?

Answer 9

True

Question 10

Name 1 popular kind of standardised score

Answer 10

T score

Question 11

What is the most popular approach to transmuting a non normal distribution into a normal one?

Answer 11

Converting percentiles to normalised standard scores

Question 12

What is a drawback of converting percentiles to normalised standard scores?

Answer 12

Normalised standard scores are a nonlinear transformation of the raw scores

Question 13

Name 3 historical raw score transformations

Answer 13

1. Staines
2. Stens
3. C Scale

Question 14

What is a standing scale?

Answer 14

Raw scores are converted to a single digits ranging from 1 to 9. The mean is always 5 and the standard deviation is approx 2

Question 15

How many units are in a stern scale?

Answer 15

10

Question 16

How many units are in a C scale?

Answer 16

11