Statistics Chapters 4-5

Question 1

What is bivariate data?

Answer 1

Data which has pairs of values for two variables

Question 2

What is correlation?

Answer 2

The nature of the linear relationship between two variables

Question 3

How can you determine if two correlated pieces of data have a causal relationship?

Answer 3

Use the context from the question and common sense

Question 4

What is the regression line?

Answer 4

A line of best fit showing the change of one variable in relationship to another

Question 5

How is the regression line of y on x written?

Answer 5

y = a + bx

b: change in y for each unit change in x

Question 6

When can a regression line be used to make predictions? (2)

Answer 6

For the value of the dependent variable (not independent)

Within the range of the data (never extrapolate)

Question 7

What is a Venn diagram used for?

Answer 7

Representing events graphically using probabilities or frequencies

Question 8

What is true for mutually exclusive events?

Answer 8

P(AUB) = P(A) + P(B)

Question 9

What is true for independent events?

Answer 9

P(AΠB) = P(A) x P(B)

Question 10

What does a tree diagram show?

Answer 10

The outcomes of two or more events happening in succession