Probability & Sampling Test Review

Front

What is probability?

Back

Probability is a measure of how likely an event is to occur, expressed as a number between 0 (impossible) and 1 (certain).

Front

What does it mean if an event is 'certain'?

Back

An event is 'certain' if it is guaranteed to happen, with a probability of 1.

Front

What does it mean if an event is 'impossible'?

Back

An event is 'impossible' if it cannot happen at all, with a probability of 0.

Front

What is a sample in statistics?

Back

A sample is a subset of a population used to represent the entire group.

Front

What is the difference between a population and a sample?

Back

A population includes all members of a specified group, while a sample includes only a part of that group.

Front

What is a median in statistics?

Back

The median is the middle value in a list of numbers sorted in ascending order.

Front

How do you find the median of a set of numbers?

Back

To find the median, arrange the numbers in order and identify the middle number. If there is an even number of values, average the two middle numbers.

Front

What is the probability of selecting a specific item from a group?

Back

The probability is calculated by dividing the number of favorable outcomes by the total number of possible outcomes.

Front

If a bag contains 10 red and 5 blue marbles, what is the probability of picking a red marble?

Back

The probability of picking a red marble is 10/(10+5) = 10/15 = 2/3.

Front

What does it mean if two events are independent?

Back

Two events are independent if the occurrence of one does not affect the occurrence of the other.