Mark is using a one-sample t-test on the following group:

Subject #15: 7.5 hours

Subject #27: 6 hours

Subject #48: 7 hours

Subject #80: 6.5 hours

Subject #91: 6.5 hours

Subject #59: 7 hours

Select the two TRUE statements.

Select the two TRUE statements. C] a.} The value for the degrees of freedom for Mark's sample population is six. b.) Mark would use the population standard deviation to calculate a t 0 _ _ _ distribution. C] c.) The tdistribution that Mark uses has thicker tails than a standard normal distribution. C] d.) The value for the degrees of freedom for Mark's sample population is ve. 9.} The tdistribution that Mark uses has thinner tails than a standard 0 _ _ _ distribution