AP Stats Semester 1 Review

Front

What is the mean in a normal distribution?

Back

The mean is the average value of a set of data, representing the center of the distribution.

Front

What is the standard deviation in a normal distribution?

Back

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

Front

How do you find the area under the normal curve to the left of a given z-score?

Back

Use a standard normal distribution table or calculator to find the cumulative probability associated with the z-score.

Front

What does a z-score represent?

Back

A z-score indicates how many standard deviations an element is from the mean of the distribution.

Front

What is the 60th percentile in a data set?

Back

The 60th percentile is the value below which 60% of the data falls.

Front

What is a convenience sampling method?

Back

Convenience sampling involves selecting individuals who are easiest to reach, rather than using a random selection.

Front

What is the formula for calculating a z-score?

Back

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

Front

What does it mean if a score is at the 40th percentile?

Back

It means that 40% of the scores are below that score.

Front

What is the purpose of a normal distribution?

Back

Normal distribution is used to model real-valued random variables whose distributions are not known.

Front

What is the significance of the area under the normal curve?

Back

The area under the curve represents the total probability of all outcomes, which equals 1.