It has long been stated that the mean temperature of humans is

98.6F.

However, two researchers currently involved in the subject thought that the mean temperature of humans is less than

98.6F.

They measured the temperatures of healthy adults at different times of day obtaining

250

measurements. The sample data resulted in a sample mean of

98.4F

and a sample standard deviation of

1.1F.

Use the P-value approach to conduct a hypothesis test to judge whether the mean temperature of humans is less than

98.6F

at the

=0.01

level of significance