Review: Statistical Data

Rebecca is interested in how much money people spend in dollars on textbooks per college class. She collects data and gets the following totals: {152, 78, 115, 102, 88, 195, 112, 174, 98, 143, 122, 130}.

Calculate the mean of the data.

• $116.08

• $137.18

• $150.91

• $125.75

The skewness measures the lack of _______ in a distribution. More _______ on one half of the distribution will create skewed data.

• symmetry, variation

• balance, dispersion

• uniformity, concentration

• equilibrium, spread

How would you describe the data in the image?

• skewed right

• skewed left

• symmetrical

• uniform

If the mean is really close to the mode, then the distribution is _________.

• symmetric.

• skewed left.

• skewed right.

• uniform.

• variance.

• mean absolute deviation.

• standard deviation.

• z-score.

Larger M.A.D. = _______ variability = data _______ spread out.

• greater, more

• lesser, less

• equal, equally

• smaller, less

Calculate the Mean Absolute Deviation (M.A.D.) of the following dataset: {3, 4, 8, 6, 10, 5, 7, 1, 9, 7}.

• 2.4

• 3.2

• 4.5

• 5.1

Range = _______ - _______

Range and IQR are measures of _________.

• spread

• central tendency

• frequency

• variance

IQR = _______ - _______.