EOC EOC Statistics and Probability 2

Question 1

What is 'standard deviation' a measure of?

Accepted Answer

How spread out values are from the mean

Answer

The average value in a data set

Answer

The middle value in a data set

Answer

The total number of data points

Question 2

If two events are independent, how is the probability that both occur calculated?

Accepted Answer

By multiplying their individual probabilities

Answer

By adding their individual probabilities

Answer

By subtracting their probabilities

Answer

By dividing one probability by the other

Question 3

A scatter plot shows data points clustered closely along a line going from lower-left to upper-right. What does this indicate?

Accepted Answer

A strong positive correlation

Answer

A negative correlation

Answer

No correlation

Answer

A non-linear relationship

Question 4

What is the 'mode' of a data set?

Accepted Answer

The most frequently occurring value

Answer

The average value

Answer

The middle value

Answer

The lowest value

Question 5

Which measure of central tendency is most affected by extreme outliers in a data set?

Accepted Answer

Mean

Answer

Mode

Answer

Median

Answer

Range

Question 6

What does a correlation coefficient of -1 indicate?

Accepted Answer

A perfect negative linear relationship

Answer

No relationship between variables

Answer

A perfect positive linear relationship

Answer

A non-linear relationship