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Read through the article, Racial and Gender Disparities in the Physician Assistant Profession (Smith & Jacobson, 2016), and answer the following questions.

a. Name the most notable source of bias that exists in this study’s sample (mentioned first in the Methods section). What steps did the data provider do to try and combat this source of bias? (2pt)

b. Why do you think the authors compared various characteristics between survey respondents who did not answer the income survey question to those that did answer it? (1pt)

c. Describe the shape of the distribution of total income from primary clinical employer. What is the one mistake the authors made in their graph of this distribution? (1pt)

d. Calculate the 95% confidence interval for the mean annual salary for the entire population (all genders, ethnicities, etc. combined).