Travelocity would like to test if the average roundtrip airfare between New York and London is equal to $1,400. A random sample of 30 flights between New York and London was selected and an average airfare of $1,330 was recorded for the sample. The sample standard deviation is $230. Use alpha = 0.01. The null hypothesis is formulated as follows:

Select one:

a.H0: Mu is less than or equal to 1,400.

b.H0: Mu is strictly less than 1,400.

c.H0: Mu is not equal to 1,400.

d.H0: Mu is equal to 1,400.