4. A market research firm reported the mean annual earnings of all family practitioners in the United States was $178,258. A random sample of 54 family practitioners in Los Angeles had the sample mean...

Extracted text: 4. A market research firm reported the mean annual earnings of all family practitioners in the United States was $178,258. A random sample of 54 family practitioners in Los Angeles had the sample mean earnings of $192,780 with a sample standard deviation of $43,337. 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 a = 0.01 level of significance. a) State the null and alternative hypotheses. b) Determine about the hypotheses test (Explain about tail test and standardized probability table) c) Find the critical value that correspond to level of significance. d) Find the test value (test statistics) e) What is the decision? f) Conclude(interpret) the decision, Using the suitable sentence