Module 7 Practice Questions (2)

Front

What is a continuous random variable?

Back

A continuous random variable can take any value within a given range. Examples include measurements like height, weight, and temperature.

Front

What is a discrete random variable?

Back

A discrete random variable can take only specific values, often counted in whole numbers. Examples include the number of books, pets, or cars.

Front

What is the mean of a probability distribution?

Back

The mean of a probability distribution is the average value, calculated as the sum of all possible values multiplied by their probabilities.

Front

Classify the number of cheeseburgers served at a restaurant: Continuous, Discrete, or Abstract?

Back

Discrete - because it can only take whole number values.

Front

How do you calculate a z-score?

Back

Z-score = (X - μ) / σ, where X is the value, μ is the mean, and σ is the standard deviation.

Front

What is the z-score for Sarah who earns $30 an hour, given a mean of $35 and a standard deviation of $5?

Back

-1.0

Front

What is the probability distribution?

Back

A probability distribution describes how the probabilities are distributed over the values of a random variable.

Front

What is the difference between a population and a sample?

Back

A population includes all members of a specified group, while a sample is a subset of the population used for analysis.

Front

What does it mean for a distribution to be normally distributed?

Back

A normally distributed variable has a symmetric bell-shaped curve, where most values cluster around the mean.

Front

What is standard deviation?

Back

Standard deviation measures the amount of variation or dispersion in a set of values.