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Is there a doctor in the house

A market research firm reported the mean annual earnings of all family practitioners in the United States was . A random sample of family practitioners in Los Angeles had mean earnings of with a standard deviation of . Do the data provide sufficient evidence to conclude that the mean salary for family practitioners in Los Angeles differs from the national average? Use the

level of significance and the critical value method with the table.

(a) State the appropriate null and alternate hypotheses.

(b) Compute the value of the test statistic.

(c) State a conclusion. Use the

level of significance.