Gallaudet University offers a liberal education and career development for deaf and hard-of-hearing students. A researcher sent surveys to 334 alumni who had graduated from Gallaudet between December 2010 and August 2011. Of 176 alumni who completed at least part of the survey, 134 were employed, and of those 134 alumni, 111 revealed their salary (in dollars). See Table 17.

a. Which class contains the median salary of respondents to the survey who earned a bachelor€™s degree?
b. Which class contains the median salary of respondents to the survey who earned a master€™s degree?
c. Which class contains the median salary of respondents to the survey who earned a degree beyond a master€™s?
d. Explain why it makes sense that the median described in part (a) is smaller than the median described in part (b), which is smaller than the median described in part (c).
e. Describe at least two possible reasons why 23 respondents to the survey did not reveal their salaries. What type of bias occurred? If those 23 people had revealed their salaries, how might your results to parts (a), (b), and (c) have been affected?
f. The researcher who conducted the study concluded that the median salary of alumni who earned a bachelor€™s degree between December 2010 and August 2011 is in the class $20,000€“$29,999. Describe three potential problems with drawing this conclusion.

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Table 17 Salaries of Recent Graduates of Gallaudet University Salary Range (dollars) Highest Degree Earned Bachelor's Master's Beyond Master's 0-9,999 10,000-19,999 20,000-29,999 30,000-39,999 40,000-49,999 50,000-59,999 60,000-69,999 70,000-79,999 80,000-89,999 90,000-99,999 100,000 or more 4 4 18 10