An engineer has designed a new light bulb to last longer than the old light bulbs her company makes now. The old light bulbs have a mean lifetime of 1200 hours. She is planning a hypothesis test to determine whether bulbs of her new design actually last longer than the bulbs of the old design. Use this information for the next two questions. Question 21 (0.5 points) What is the null hypothesis for this study?

Question 21 options:

a) H0:<1200{"version":"1.1","math":"H_0:\mu<1200"}

b) H0:1200{"version":"1.1","math":"H_0:\mu eq1200"}

c) H0:=1200{"version":"1.1","math":"H_0:\mu=1200"}

d) H0:>1200{"version":"1.1","math":"H_0:\mu>1200"}

What is the alternative hypothesis for this study?

a) Ha:<1200{"version":"1.1","math":"H_a:\mu<1200"}

b) Ha:1200{"version":"1.1","math":"H_a:\mu eq1200"}

c) Ha:=1200{"version":"1.1","math":"H_a:\mu=1200"}

d) Ha:>1200{"version":"1.1","math":"H_a:\mu>1200"}