Data: Inferential Statistics And Probability

Question 1

Do descriptive statistics allow us to draw inferences (conclusions)

Answer 1

• no
• only inferential tests allow us to draw inferences about populations from the samples of data tested
• allowing us to show if there’s a significant difference between the levels of IV )or the relationship between co-variables

Question 2

Which hypothesis do you accept if the results are significant and which do you reject

Answer 2

• accept alternative
• accept null

Question 3

What is the definition of probability value

Answer 3

• A numerical value that gives an indication of the likelihood that results are due to a real difference/correlation and not due to chance factors
• if not given, use a <0.005

Question 4

What does ‘P<0.005’ mean

Answer 4

The probability that the results are due to chance is equal to or less than 5%

Question 5

What is a strict probability and lenient

Answer 5

• strict: P<0.01
• lenient: P<0.10

—> strict is good for medical trials where accuracy is key