Understanding Data and Statistics Concepts

What is the term used to describe a graph that shows the distribution of a data set with two peaks?

• Symmetric

• Bimodal

• Skewed

• Uniform

Which of the following is a measure of center in a data set?

• Quartile

• Interquartile Range

• Mean

• Standard Deviation

What type of plot is used to display the five-number summary of a data set?

• Histogram

• Scatter Plot

• Box Plot

• Dot Plot

Which of the following best describes a negative association between two variables?

• As one variable increases, the other variable increases.

• As one variable increases, the other variable decreases.

• Both variables remain constant.

• Both variables decrease.

If a data set is symmetric, what can be said about its mean and median?

• The mean is greater than the median.

• The mean is less than the median.

• The mean and median are equal.

• The mean and median cannot be compared.

Which of the following is a graphical representation that can show a linear association between two quantitative variables?

• Histogram

• Scatter Plot

• Box Plot

• Dot Plot

Calculate the interquartile range (IQR) for the following data set: 3, 7, 8, 12, 13, 14, 18.

• 5

• 6

• 7

• 8

A scatter plot shows a positive association between two variables. What does this imply about the correlation coefficient?

• It is negative.

• It is zero.

• It is positive.

• It is undefined.

Which of the following is NOT a characteristic of a bell-shaped distribution?

• Symmetric

• Bimodal

• Unimodal

• Mean, median, and mode are equal

What is the purpose of a residual plot in regression analysis?

• To determine the correlation coefficient

• To assess the fit of a regression line

• To calculate the mean of the data

• To find the median of the data