Exam 4: Numerical Descriptive Techniques

Slopes and trends in a line chart appear to be steeper if you ____________________ the horizontal (time) axis.

Graphical and numerical techniques, such as histograms and least squares lines provide identical information.

Which of the following summary measures is sensitive to extreme values?

Assuming a linear relationship between X and Y, if the coefficient of correlation (r) equals -0.75, this means that:

NARRBEGIN: Salaries of Office Worker Salaries of Office Workers The following data represent the salaries (in thousands of dollars) of a sample of 13 office workers of a firm: 26.5, 23.5, 29.7, 24.8, 21.1, 24.3, 20.4, 22.7, 27.2, 23.7, 24.1, 24.8, and 28.2.NARREND -{Salaries of Office Workers Narrative} Compute the coefficient of variation, and express the number in the appropriate unit.

A bar chart can be made to look deceptive if the Y-axis starts at a number other than zero.

If the form of the graph replaces the substance of the data, the graph is performing to function and graphical excellence is achieved.

Graphical excellence gives the greatest number of ideas in the shortest time with the least ink in the smallest space.

NARRBEGIN: Weights of Teachers Weights of Teachers The following data represent the weights in pounds of a sample of 25 teachers: 164, 148, 137, 157, 173, 156, 177, 172, 169, 165, 145, 168, 163, 162, 174, 152, 156, 168, 154, 151, 174, 146, 134, 140, and 171.NARREND -{Weights of Teachers Narrative} Compute the range and coefficient of variation.

The interquartile range is a measure of variability in a set of data.

A percentile is a measure of ____________________ standing.

The ____________________ uses both the mean and the standard deviation to interpret standard deviation for bell shaped histograms.

The effect of making the slope of a line chart appear steeper can be created by:

What statistics and graphs can you use to answer the following question: Is the distribution symmetric? If not, is it skewed? If symmetric, is it bell shaped?

The interquartile range is an interval of numbers starting at Q₁ and ending at Q₃.

Scatter diagrams, covariance, and the coefficient of correlation are useful techniques for detecting relationships between two ____________________ variables.

NARRBEGIN: Weights of Police Officer Weights of Police Officers The following data represent the weights in pounds of a sample of 25 police officers: 164, 148, 137, 157, 173, 156, 177, 172, 169, 165, 145, 168, 163, 162, 174, 152, 156, 168, 154, 151, 174, 146, 134, 140, and 171.NARREND -{Weights of Police Officers Narrative} Calculate the 3^rd and 7^th deciles of the data.

Which of the following statements about the mean is not always correct?

Chebysheff's Theorem applies only to data sets that have a bell shaped distribution.

NARRBEGIN: Weights of Teachers Weights of Teachers The following data represent the weights in pounds of a sample of 25 teachers: 164, 148, 137, 157, 173, 156, 177, 172, 169, 165, 145, 168, 163, 162, 174, 152, 156, 168, 154, 151, 174, 146, 134, 140, and 171.NARREND -{Weights of Teachers Narrative} Compute the sample variance, and sample standard deviation.