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  $178,258 . A random sample of  57  family practitioners in Los Angeles had mean earnings of  =x$192,890  with a standard deviation of  $43,107 . 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  =α0.10  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  =α0.10  level of significance.

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