Exam 3: Descriptive Statistics

What does the vertical line in the normal distribution represent?

When students enroll in school and are provided with an identification number-a combination of letters and numbers-this number is on the ___ scale.

Variance is described as the degree or amount of dispersion in a data set.

Why should care be taken when interpreting results whose distributions are positively or negatively skewed?

When the mean score is represented as ± 2, what type of score is this?

Using the data set below, answer the questions that follow. -What is the range?

Define and provide an example of the four different numerical scales.

In a normal distribution, most students' scores fall at the edges of the bell curve.

Draw pictures of a negatively skewed distribution and a positively skewed distribution. Explain each.

A graph of class data is below. What is this type of graph called?

Using the data set below, answer the questions that follow. -What is the mode?

What is a normal distribution and why is it important in understanding student performance?

Large sets of data are organized and understood through methods known as Measures of Central Tendency.

In order for a score to be considered significant it must be at least two standard deviations from the mean.

This term is used when a national sample of students of the same age/grade take the same assessment and establish a mean and standard deviation.

Which number is representative of a raw score?

Organizing data to see how the data spread away from the mean is called

What type of distribution is depicted below?

The square root of the variance is the sum of squares.

Explain why it is important to graph data.