Difficulty: Easy

Average Score: 100%

The starling, a bird species imported from Europe, competes with the native bluebird for food and nesting sites. In order to increase the number of nesting sites, an environmental group set up nesting boxes with holes small enough to exclude the starlings. Below is a graph showing the yearly effect of the special nesting boxes for bluebirds.

Which of these years had the biggest increase in nesting sites over the preceding year?

Rationale

1993 had the biggest increase in nesting sites over the preceding year.

The question asks which year had the most significant increase in nesting sites compared to the previous year. This requires comparing the difference in the number of nesting sites from one year to the next.

A (1992) YOUR ANSWER

The number of nesting sites in 1992 did indeed increase from 1991. However, the increase is not the largest when compared to the increases observed in other years.

B (1990) YOUR ANSWER

While there might have been an increase in nesting sites in 1990 from the previous year, the increase was not as significant as the increase observed in 1993.

C (1993) CORRECT

1993 saw the most considerable increase in nesting sites compared to the preceding year, 1992. The change in the number of nesting sites from 1992 to 1993 is greater than any other year-to-year change during the observed period.

D (1942) YOUR ANSWER

The data does not provide information about the number of nesting sites in 1942 or any changes from the previous year. Therefore, it cannot be determined if 1942 had an increase in nesting sites over the preceding year.

Conclusion

After comparing the yearly changes in the number of nesting sites, it is clear that 1993 had the biggest increase from the preceding year. The other years either had smaller increases or lacked sufficient data to make a comparison. The environmental group's efforts to increase the number of nesting sites for bluebirds by introducing nesting boxes seem to have had the most significant impact in 1993.

Which of these years had the biggest increase in nesting sites over the preceding year?

1993 had the biggest increase in nesting sites over the preceding year.

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