Recall that the file P4_1.XLS contains a data set that represents 30 responses from a questionnaire concerning the president’s environmental policies. Each observation lists the person’s age, gender, state of residence, number of children, annual salary, and opinion of the president’s environmental policies. 

a. Find all respondents who are either (1) middle-aged men with at least one child and an annual salary of at least $50,000, or (2) middle-aged women with two or fewer children and an annual salary of at least $30,000.

b. Find the mean and median salaries of the respondents who meet the conditions specified above. ¢ What proportion of the respondents who satisfy the conditions specified above agree or strongly agree with the president’s environmental policies?