Statistics and Probability Exam

Front

In a circle graph, if a sector represents 25% of the data, what is the angle of the sector?

Back

90 degrees

Front

Which of the following represents the first quartile (Q1) in a data set?

Back

The median of the lower half of the data set

Front

What does the correlation coefficient measure?

Back

The strength and direction of a linear relationship

Front

According to the empirical rule, what percentage of data falls within one standard deviation of the mean in a normal distribution?

Back

68%

Front

Ervin bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is the sample standard deviation of Ervin's scores?

Back

20.94

Front

What is the definition of a quartile in statistics?

Back

A quartile is a type of quantile that divides a data set into four equal parts.

Front

What is the formula for calculating the mean of a data set?

Back

Mean = (Sum of all data points) / (Number of data points)

Front

What does a standard deviation indicate about a data set?

Back

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

Front

What is the difference between population and sample in statistics?

Back

Population includes all members of a defined group, while a sample is a subset of the population.

Front

What is a normal distribution?

Back

A normal distribution is a probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence.