1) "A researcher believes that the mean age of medical doctors in a large hospital system is older than the average age of doctors in the United States, which is 46. Assume the population standard deviation is 4.2 years. A random sample of 30 doctors from the system is selected, and the mean age of the sample is 48.6. Test the claim at alpha = 0.05."

a) Average age of the doctors in the system is lesser than the national average of 46.

b) Average age of the doctors in the system cannot be specified

c) .Average age of the doctors in the system is greater than the national average of 46.

d) None of the above

2) Consider the variables x and y , calculate the coefficient slope for the regression equation y=b1x+bo where x=9,7,2 and y=3,4,5."

a) -0.269

b) 0.269

c) 1

d) 0