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To address everyday problems, and to develop strategic plans for improving services and collections, librarians routinely tap the rich data sources that are contained in the library's internal documents. These include the library's transaction and financial reports, circulation records, turnstile/exit counts, program attendance sheets, budget statements, overdue fee records, purchase orders, invoices, and payment vouchers. This information is at the heart of library service. Figure 1-1 identifies several of the library's most significant internal data resources.

A book's title and a river's name both are examples of a qualitative variable. 4. True The number of books must be a whole number. 5. False Counts yield discrete measurement. Continuous measurement examples include height, weight, temperature, and distance. 6.

A population itself can serve as a backdrop for comparison. A census, for example, describes the number of people out of the total population that can be characterized as having a certain age, occupation, or income. Internal comparisons are possible as well. From the same census, the income of one person could be compared to that of another. Many such standards and comparisons are possible. Time-population comparisons are frequently encountered in statistical analysis. For example, a time-population backdrop is used in determining the number of books published in a certain category over a time period.

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