Sampling and Probability Concepts

This video tutorial covers the basics of probability and statistics, focusing on understanding populations and samples, different sampling methods, and the fundamentals of probability. It includes examples and exercises to practice probability calculations and data analysis, helping students learn how to estimate probabilities and analyze sample data effectively.

What is the difference between a population and a sample?

• A sample is a subset of a population.

• A population is a subset of a sample.

• A population is always larger than a sample.

• A sample is always larger than a population.

Which of the following is a characteristic of a reasonable sample?

• It is representative of the population.

• It is smaller than the population.

• It is selected based on convenience.

• It is biased towards a specific group.

Why is a survey of 70 students randomly selected from a school considered the best sampling method?

• It is a random and large enough sample.

• It is a small sample size.

• It is a sample of friends.

• It is a biased sample.

What is the probability of drawing a red marble from a bag containing 4 yellow, 3 red, and 2 green marbles?

• 3/4

• 3/9

• 1/9

• 1/3

If a probability is expressed as 0.5, how is it described?

• Certain

• Impossible

• As likely as not

• Unlikely

What is the probability of spinning a number greater than five on a spinner with numbers 1 to 6?

• 1/2

• 1/3

• 0

• 1/6

In a set of letter tiles spelling 'American', what is the probability of picking a letter other than 'A'?

• 7/8

• 2/8

• 6/8

• 1/8

How many musical symbol cards are estimated to be in a deck of 200 cards if 3 out of 23 sampled cards are musical symbols?

• 13

• 26

• 52

• 39

If 4 out of 22 sampled sci-fi trading cards are movie cards, how many movie cards are estimated in a deck of 200?

• 32

• 36

• 44

• 40

What is the probability of selecting a Granny Smith apple from a market with 52 Granny Smiths out of 190 apples?

• 1/190

• 1/95

• 52/190

• 26/95