Research Statistics

Question 1

What is standard deviation?

Answer 1

• Shows us the average difference between each value and the mean

Question 2

What does a low SD mean?

Answer 2

Closer to the mean

Question 3

What is a nominal variable?

Answer 3

Sex, marital status

Question 4

What is an ordinal variable?

Answer 4

Glasgow coma scale; a set of categories

Question 5

What is an interval variable

Answer 5

A scale without absolute zero, e.g. time of day

Question 6

What is a ratio variable

Answer 6

A scale with absolute zero: heart rate, blood pressures etc

Question 7

What is correlation?

Answer 7

Relationship between two variables

Question 8

What is an R number?

Answer 8

• A correlation coefficient - how strong the relationship between 2 variables is.
• • 1 negative correlation
• 0 no correlation
• +1 positive correlation

Question 9

What letter represents significance?

Answer 9

P

Question 10

What do the percentages of p mean?

Answer 10

p= 0.05 means result has a 5% risk of happening by chance

Above 5% is non significant

p = % risk that it happened by chance

Question 11

What does t represent?

Answer 11

Differences. Measures the strength of the difference between two variables

Higher t = strong difference

Lower t = weak difference