Method: Histogram

Methods: Outlier, Histogram, Mean, Median, Boxplot, Distribution,
Topics: Economics,
Datafile Name: CEO Salaries

Forbes magazine published data on the best small firms in 1993. These were firms with annual sales of more than five and less than $350 million. Firms were ranked by five-year average return on investment. The data extracted are the age and annual salary of the chief executive officer for the fir...

Methods: Distribution, Histogram,
Topics: Miscellaneous,
Datafile Name: Militiamen Chests

These data summarize the chest sizes of Scottish militiamen in the early 19th century. Chest sizes are measured in inches, and each observation reports the number of soldiers with that chest size. A histogram of chest sizes shows an approximately normal curve. Notice that the histogram must be dr...

Methods: ANOVA, Boxplot, Histogram, Median, Transformation,
Topics: Nutrition,
Datafile Name: Calories

"Let the buyer beware" is a phrase that comes to mind when buying a used car, not when buying food. However, Allison, Heshka, Sepulveda, and Heymsfield (1993) think that this phrase should apply to purchasing "diet" and "health" foods as well. They purchased 40 such ...

Methods: Distribution, Histogram, Summary Statistics,
Topics: Physics, Science,
Datafile Name: Cavendish

In 1798, Henry Cavendish estimated the density of the earth by using a torsion balance. The "Cavendish" dataset contains his 29 measurements of the density of the earth, presented as a multiple of the density of water. The average measurement is 5.42, suggesting that the density of the ...

Methods: Outlier, Summary Statistics, Mean, Median, Histogram, Boxplot,
Topics: Miscellaneous,
Datafile Name: Distribution Patterns

This "story" illustrates some of the different distribution patterns that variables may take on. The distribution of Tobin's Q-ratios for firms shows high positive skewness. Sometimes this can be 'remedied' by taking the logarithms of the data. Try this for the Q-ratios. Oth...

Methods: Confidence Interval, Distribution, Histogram, Outlier,
Topics: Science,
Datafile Name: Speed of Light

Simon Newcomb measured the time required for light to travel from his laboratory on the Potomac River to a mirror at the base of the Washington Monument and back, a total distance of about 7400 meters. These measurements were used to estimate the speed of light.

A histogram or dotplot o...

Methods: Histogram, Paired T-Test,
Topics: Psychology,
Datafile Name: Friday the 13th

Is Friday the 13th an unusually unlucky day, or is this just superstition? How do superstitions affect people's behavior? These questions were addressed by researchers Scanlon, et al. (1993) in a study that examined the relationship between behavior and superstition in the United Kingdom. The...

Methods: Histogram, Scatterplot, Regression,
Topics: Nutrition, Health,
Datafile Name: Cereals

This datafile contains nutritional information and grocery shelf location for 77 breakfast cereals. Current research states that adults should consume no more than 30% of their calories in the form of fat, they need about 50 grams (women) or 63 grams (men) of protein daily, and should provide for...

Methods: Histogram, Mean, Median, Outlier,
Topics: Sports,
Datafile Name: Crews

The dataset contains the weights in stones and pounds of the crews participating in the Oxford and Cambridge boat race in 1992. The weights have been converted to pounds for convenience.

Figure 1 is a histogram of weights for the crews in the 1992 Cambridge vs. Oxford boat race. The two...

Methods: Distribution, Median, Probability, Histogram,
Topics: Automotive, Engineering,
Datafile Name: U.S. Vehicle Weights, '75-'90

Frequency distributions are given for the weights of cars, trucks, and light duty vehicles sold in the United States in 1975 and in 1990. The class intervals are not the same through the entire listing, however. This creates problems in plot- ting frequency polygons. These will be a correct inter...

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