Scales of measurement 3.1

Question 1

Increasing confidence in the validity of your

operational definitions

Answer 1

1) conventional methods

2) Use a manipulation check

Question 2

Conventional methods

Answer 2

•Already passed peer review
•Relates to previous research
•Researchers have knowledge
of the strengths and
weaknesses

Question 3

Manipulation check

Answer 3

make sure your manipulation (IV)

worked by taking a measure of it’s construct

Question 4

Scales of measurement for quantitative stats

Answer 4

• Nominal data
• Categories that have no inherent order to them, just labels
• Ordinal data
• Categories that have an order to them, difference between them are not equal
• Interval data
• Categories (units) that are ordered and each is equivalent in size, but no true zero
• Ratio data
• Ordered, equivalent categories (units) with a true zero

Question 5

Central tendency

Answer 5

Mode: most frequent, nominal data

Median: mid point, ordinal, interval, ratio

Mean: average, interval and ration

Question 6

Spread of Data

Answer 6

Range: number of possible scores in dataset

Standard Deviation:the average distance a score falls from the
mean

Variance:squared deviation

Question 7

Normal distribution

Answer 7

Probability distribution with a mean

of zero that follows the 68-95-99.7 rule/