Download e-book for iPad: Statistics for Business and Economics by Paul Newbold

By Paul Newbold

ISBN-10: 0132745658

ISBN-13: 9780132745659

A vintage textual content for accuracy and statistical precision.

 

Statistics for company and Economics allows readers to behavior severe research of utilized difficulties instead of working uncomplicated “canned” functions. this article can also be at a mathematically greater point than such a lot company facts texts and gives readers with the data they should turn into improved analysts for destiny managerial positions.

 

The 8th variation of this booklet has been revised and up-to-date to supply readers with more desirable challenge contexts for studying how statistical tools can enhance their research and figuring out of industrial and economics.

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Example text

Determine and interpret the relative cumulative frequencies. 53 In one region it was found that 28% of people with incomes less than $50,000 use the Internet; 48% of those with incomes between $50,000 to $74,999 use the Internet; and 70% of those with incomes of at least $75,000 use the Internet. Use a pie chart or a bar chart to plot this data. S. Congress are recognizing both the values and emerging issues for small firms as the Sarbanes-Oxley Act of 2002 (SOX) has been implemented. On April 23, 2006, the Advisory Committee on Smaller Public Companies issued a final report to the Security and Exchange Commission assessing the impact of SOX on smaller public companies (Final Report 2006).

39 Ann Thorne, the operations manager at a suntan lotion manufacturing plant, wants to be sure that the filling process for 8-oz (237 mL) bottles of SunProtector is operating properly. Suppose that a random sample of 100 bottles of this lotion is selected, the contents are measured, and the volumes (in mL) are stored in the data file Sun. Describe the data graphically. 40 A company sets different prices for a particular DVD system in eight different regions of the country. The accompanying table shows the numbers of units sold and the corresponding prices (in dollars).

Even if we remember that it is the areas, rather than the heights, of the rectangles of the histogram that must be proportional to the frequencies, it is still never a desirable option to construct such a histogram with different widths because it may easily deceive or distort the findings. We include this section simply to point out potential errors that we might find in histograms. 13 we illustrate the construction of a histogram when interval widths are not all the same. 13 Grocery Receipts (Unequal Interval Widths) The dollar amounts of a random sample of 692 grocery receipts are summarized in the frequency distribution given in Table 1.

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Statistics for Business and Economics by Paul Newbold


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