Units 2 and 3 Exam Prep

Question 1

True or false: In a left-skewed distribution, the mean is approximately the same as the median.

Accepted Answer

False

Question 2

True or false: Empirical probability is based on the results of experiments.

Accepted Answer

True

Question 3

Which measure quantifies the spread of data?

Accepted Answer

Standard deviation

Question 4

True or false: Probability ranges from -1 to 1.

Accepted Answer

False

Question 5

True or false: The law of large numbers says with enough trials empirical and theoretical probability is the same.

Accepted Answer

True

Question 6

What is the median?

Accepted Answer

Middle value

Question 7

True or false: The total probability of all events in a probability space equals 1.

Accepted Answer

True

Question 8

True or false: A histogram displays frequency distribution.

Accepted Answer

True

Question 9

Which is a basic probability rule?

Accepted Answer

Addition rule, Multiplication rule

Question 10

What is the shape of the distribution shown below?

Accepted Answer

Bell-shaped

Question 11

True or false: In a right-skewed distribution, the mean is always greater than the median.

Accepted Answer

True

Question 12

True or false: The median is a resistant measure of center to skewing.

Accepted Answer

True

Question 13

True or false: Outliers affect the mean significantly.

Accepted Answer

True

Question 14

True or false: The mean is always the best measure of central tendency.

Accepted Answer

False

Question 15

True or false: A uniform distribution has equal frequencies.

Accepted Answer

True

Question 16

What does a dotplot display?

Accepted Answer

Data frequency

Question 17

What is the range?

Accepted Answer

MAX - MIN

Question 18

Which is a measure of central tendency (center)?

Accepted Answer

Mean

Question 19

What is conditional probability?

Accepted Answer

Probability of A given B

Question 20

What does interquartile range (IQR) measure?

Accepted Answer

The spread of the middle 50% of data

Question 21

What is joint probability?

Accepted Answer

Probability of A and B

Questions 21