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

42

family practitioners in Los Angeles had mean earnings of

x

=$191,350

with a standard deviation of

$42,727

. 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

=0.05

level of significance and the

P

-value method with the TI-84 Plus calculator.

Part: 0 / 5

0 of 5 Parts Complete

Part 1 of 5

(a) State the appropriate null and alternate hypotheses.

:H0

:H1

This hypothesis test is a (Choose one) test ? left tail, right tail or two tailed ?